See the above link for United States Supreme Court Justices quoting my work regarding neurotoxic causes of crime.

Some Career Highlights and Forensic Achievements of

Dr. Raymond Singer


1978: Awarded the Doctor of Philosophy degree from Washington State University, Department of Psychology.

1979: Awarded the National Institute of Health Post-Doctoral Fellow in Biological Psychiatry, Millhauser Laboratory, New York University Medical Center, New York City.


1980: Awarded the National Institute of Health Post-Doctoral Fellow in Environmental Epidemiology, Mount Sinai School of Medicine, New York City, under the direction of Dr. Irving J. Selikoff, one of the top applied toxicologists in the world, who brought the dangers of asbestos to the world's attention.

1982: Published research demonstrating the harmful effects of dioxin on the human nervous system (one of the first on this topic)

Singer, R., Moses, M., Valciukas, J., Lilis, R., & Selikoff, I. J. (1982). Nerve conduction velocity studies of workers employed in the manufacture of phenoxy herbicides. Environmental Research, 29, 297-311.

1983: Began independent practice as a neuropsychologist and a neurotoxicologist.

1984: Served as an expert witness in the Agent Orange Vietnam Veterans' Litigation. 

Dr. Raymond Singer and his colleagues at the Mt. Sinai School of Medicine were among the first scientists to recognize the neurotoxicity of Agent Orange and its contaminant, dioxin. Thirty years after Dr. Singer's testimony regarding the neurotoxicity of dioxin, a study was published on dioxin-exposed workers. This research confirmed Dr. Singer's opinion and the veteran's pleas, showing both peripheral and central nervous system dysfunction in dioxin workers, unrelieved years after exposure.

The last eight survivors of 80 workers accidentally exposed to 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) during production of herbicides based on trichlorophenoxyacetic acid in 1965-1967 in a chemical factory were followed. All were men, mean age 72.4 ± 1.3 years. Their current median TCDD blood level was 112 (46-390) pg/g lipids. Neurological examination revealed central nervous system impairment in all individuals and signs of polyneuropathy in 87.5%, which was confirmed by a nerve conduction study (NCS) in 75%. A Lanthony test demonstrated acquired dyschromatopsia in 87.5% of the patients, with deterioration of mean colour confusion index (CCI) from 1.52 ± 0.39 in 2010 to 1.73 ± 0.41 in 2016. Single-photon emission computer tomography (SPECT) of the brain showed focal reduction of perfusion in various brain locations in all patients and worsening in six patients. Visual-evoked potentials (VEP) was abnormal in 62.6% of individuals. Most patients complained of psychological problems. The neuropsychological test battery showed most positive impairments in the Trail Making Test evaluating processing speed (average level in the range of mild neurocognitive impairment), which correlated with mean CCI (p < 0.05).
2018 Feb;122(2):271-277. doi: 10.1111/bcpt.12899. Epub 2017 Sep 27. Neurological and Neurophysiological Findings in Workers with Chronic 2,3,7,8-Tetrachlorodibenzo-p-Dioxin Intoxication 50 Years After Exposure.

Read more here regarding the current recognition of Agent Orange toxicity

1987: With blind funding from Archer Daniels Midland and the National Renewable Fuels Association, Dr. Singer researched and developed a report regarding the advisability and neurotoxicity of certain gasoline additives, entitled The Toxicity of Gasoline Additives, circulated among U.S. Congress and staff. In this report, Dr. Singer alerted Congress that methyl tetrabutyl ether (MTBE), used as a gasoline additive, would have serious toxic consequences.

Unfortunately and against my recommendations, the U.S. Congress authorized MTBE as a fuel additive, which incurred very harmful effects.

The following is from

"At its zenith, MTBE commanded center stage in both the oil and chemical industries as companies raced to build new plants to meet the anticipated surge in demand in the U.S. gasoline market - the world's biggest - after the blendstock was touted as the cure-all to combat rising pollution.

By 2002, global demand for MTBE was approaching 22m tonnes/year, with the U.S. responsible for nearly 60% of consumption. Plants had been built worldwide to service projected demand.

Yet by the late 1990s, MTBE's demise in the U.S. as a fuel oxygenate was on the cards. It started with drivers in Alaska feeling dizzy [acute neurotoxicity] when filling their tanks in the arctic winter. Reports of the chemical seeping into the groundwater of health-conscious Americans raised alarm. Calls for its use to be stopped in the U.S. grew less than 10 years after its glowing debut."

And from

"Two studies, commissioned by the American Water Works Association (AWWA) and the Association of Metropolitan Water Agencies (AMWA), examined the cost to remove methyl tertiary butyl ether (MTBE) contamination from public drinking water systems across the United States. These studies update estimates from 2001 that then cited MTBE cleanup costs at approximately $29 billion. The new studies indicate that the cleanup costs are likely to be in the range of $25-$33.2 billion and could be as high as $85 billion or more.


"The U.S. Supreme Court on Monday rejected Exxon Mobil Corp's appeal of a $236 million judgment against the oil company in a case brought by the state of New Hampshire over groundwater contamination linked to a gasoline additive.

The justices left in place the New Hampshire Supreme Court's 2015 ruling upholding the judgment by a jury that in 2013 spurned Exxon's claims that the contamination linked to its fuel additive was not its fault but rather the fault of the local gas stations and storage facilities that spilled it... The additive at the center of the case is called methyl tertiary butyl ether, or MTBE. It is an oxygen-containing substance that was added to gasoline to promote more complete combustion and reduce air pollution."

The MTBE litigation continues:

"Maryland sues petroleum companies over groundwater contamination... The lawsuit, filed Wednesday in Baltimore City Circuit Court by Maryland Attorney General Brian E. Frosh's office, alleges that ExxonMobil, Chevron, and dozens of other companies knew a fuel additive called methyl tertiary butyl ether, or MTBE, would contaminate groundwater and tried to obstruct research about its harmful effects."

Much illness and expense could be avoided if regulators would accept common sense toxicologic reasoning. Thankfully, the USA legal system and the skill of competent lawyers can bring some toxicologic disasters to a safer conclusion. 

1987: Developed the Neurotoxicity Screening Survey, an instrument to determine the consistency of symptoms in patients diagnosed with neurotoxicity.


1990: Published the Neurotoxicity Guidebook. The publisher was Van Nostrand Reinhold, a major industrial hygiene/toxicology publisher then. This text, still in print, is one of the few single-author texts on the subject.

1990: Elected as a Fellow of the American Psychological Association in recognition of "outstanding, substantial and unusual contribution to psychology." Approximately 2% of American psychologists had been elected to this status when awarded in 1990.

1991: Consultant in neuropsychology and neurotoxicology, United States Department of Justice, Environmental Crimes Section, and Federal Bureau of Investigation. On their behalf, Dr. Singer investigated a hazardous solvent waste neurotoxicity case.

1992: Served as an expert witness in landmark litigation where the Ohio Supreme Court affirmed the right of plaintiffs to present to the Court expert witnesses in neurotoxicology and neuropsychology who are non-physicians, but who are otherwise qualified to opine regarding the cause of neurotoxicity. 

The Court unanimously accepted the testimony of Dr. Raymond Singer, stating "a witness who is not a physician, but who qualifies as an expert under [state evidence rules] may give evidence that would be relevant to the diagnosis of a medical condition" - in this case, a multiple sclerosis type condition from gasoline exposure. The court also reviewed my qualifications and stated: "Dr. Singer has an extensive and impressive vita dealing with psychology, biological effects on the central nervous system, and neurotoxicology. He has been a fellow at the National Institute of Health and at the Mount Sinai School of Medicine, has won the NIH National Research Service Award, and has a long list of publications dealing with neurotoxicity and its effects. He is qualified by "knowledge, skill, experience, training, or education" to testify on the subject of toxicity of gasoline on the human nervous system."

This case has been cited as the basis of rulings at least 15 times as of 2024, including several Ohio State Supreme Court rulings, an Iowa State Supreme Court ruling, as well as United States District Court rulings.

(For an example of extensive citing, see RON GOOLSBY, et al., Plaintiffs, v. BEST IN NEIGHBORHOOD LLC, Defendant. No. 3:19 CV 2664. United States District Court, N.D. Ohio, Western Division. March 20, 2023).

One hundred and 50 cases based their rulings on the 15 original rulings.

Shilling v. Mobile Analytical Servs., Inc., 602 N.E.2d 1154 (Ohio 1992).

1993: Board-Certified Diplomate in Neuropsychology, American Board of Professional Neuropsychology

1997: Served as an expert in Birklid et al. v. Boeing, Washington state, wherein the Court permitted claimants the right to directly sue employers for toxic injuries in specific worker's compensation claims. Birklid v. Boeing, a 1995 en banc (9-0) decision of the state Supreme Court, changed Washington State law regarding employer liability for "deliberate" injury by allowing, for the first time in 83 years, a disputed claim of deliberate injury to proceed against the state's largest employer. This was a decade-long battle culminating in the Washington Supreme Court successfully confirming Washington law in favor of protecting injured workers deliberately exposed to toxic chemicals and other injurious workplace conditions.

This case has been cited in published opinions at least 137 times as of 2021

1997: In Scaffidi v. Thompson-Hayward Chemical Inc., DC ELa, No. 94-3860, 8/12/97, the defense tried to limit the ability of plaintiffs to have neuropsychologists give medical causation. However, the Court allowed a claim against the facility's former owner to proceed, finding the medical causation proof of an organic brain dysfunction offered by a neuropsychologist experienced in neurotoxicology sufficient to allow the claim to proceed (Volume 12 Number 16, Wednesday, September 17, 1997, ISSN 1522-5240, TOXIC TORTS: OCCUPATIONAL EXPOSURE)

1994-1999: Served as president and other elected positions for the Roundtable of Toxicology Consultants (an organization of independent consulting toxicologists, composed of consultant members of the Society of Toxicology - the premier organization of toxicologists in the world).

1999: Upon the invitation of the German Federal Government, SPD Bundestagfraktion, Dr. Singer addressed The Great Assembly Hall of Parliament (Deutscher Bundestag), Wasserwerk, Bonn, Germany.


2001: Served as an expert witness in a landmark United States Appeals Court decision, enabling plaintiffs to seek compensation for injuries even if the toxicology/medical literature is incomplete.

The case involved motor dysfunction, tremor, and other neuropsychological dysfunctions in a plaintiff exposed to a novel solvent, of which the toxicological database is incomplete.

The Federal Appeals Court ruled as follows:

The first several victims of a new toxic tort should not be barred from suit simply because medical literature, which will eventually support causal connection, has not yet been completed.

Plaintiffs need not produce mathematically precise tables equating levels of exposure with levels of harm, but need merely offer evidence from which jurors can reasonably conclude that exposure probably caused injuries.

There is no requirement that plaintiff's expert must always cite published studies on general causation, nor that pertinent epidemiological studies supporting plaintiff's position exist.

Even if trial judge believes there are better grounds for some alternative conclusion, and that there are some flaws in expert's methods, expert's opinion should be admitted if there exist good grounds to support it. Only question is whether testimony is sufficiently reliable and relevant to assist jury.

Key Paragraphs


“...As a general rule, the factual basis of an expert opinion goes to the credibility of the testimony, not the admissibility, and it is up to the opposing party to examine the factual basis for the opinion in cross-examination.,Only if the expert's opinion is so fundamentally unsupported that it can offer no assistance to the jury must such testimony be excluded....”
“...To prove causation in a toxic tort case, a plaintiff must show both that the alleged toxin is capable of causing injuries like that suffered by the plaintiff in human beings subjected to the same level of exposure as the plaintiff, and that the toxin was the cause of the plaintiff's injury., [...] ,We have held, however, that "[t]he first several victims of a new toxic tort should not be barred from having their day in court simply because the medical literature, which will eventually show the connection between the victims' condition and the toxic substance, has not yet been completed.",Bonner did not "need to produce 'a mathematically precise table equating levels of exposure with levels of harm' in order to show" that she was exposed to a toxic level of FoamFlush, "but only 'evidence from which a reasonable person could conclude'" that her exposure probably caused her injuries....”
“...There is no requirement "that a medical expert must always cite published studies on general causation in order to reliably conclude that a particular object caused a particular illness.","[E]ven if the judge believes there are better grounds for some alternative conclusion, and that there are some flaws in the scientist's methods, if there are good grounds for the expert's conclusion, it should be admitted.... [T]he district court could not exclude [scientific] testimony simply because the conclusion was 'novel' if the methodology and the application of the methodology were reliable.", [...] ,Both our cases and the decisions of the Supreme Court make clear that it is the expert witnesses' methodology, rather than their conclusions, that is the primary concern of Rule 702....”

The Court further allowed the temporal association to help determine causation.

"[u]nder some circumstances, a strong temporal connection is powerful evidence of causation."

The manufacturer had attempted to exclude my testimony under Daubert rules, but the Court upheld my testimony and the original verdict. The jury determined that the plaintiff deserved $2.1 million - more than doubling the prior-to-trial settlement offer by the plaintiffs - and a precedent-setting judgment in that jurisdiction. (Bonner v. ISP Techs., Inc., 259 F.3d 924 (8th Cir. 2001)).

This decision was cited at least 384 times (378 rulings and six books and journals) as of May 19, 2024 (vlex cited below. The case was cited 460 times according to

Rulings based on the rulings that cited this decision amount to 8084 cases.  ( May  19, 2024, 10:37 pm)

This case was cited by The American Bar Association's Scientific Evidence Review: Admissibility of Use of Expert Evidence in the Courtroom. Monograph Number 6. American Bar Association: Section of Science and Technology Law (June 3, 2003).

2001: Behavioral dyscontrol is a well-known outcome of brain injuries, which may occur after brain trauma. However, the brain can also be injured by toxic chemicals, even without any outward appearance of an injury. This injury can decrease the person's capacity to control his emotions and in extreme cases, can result in violent crime. Even if a person is found guilty of a crime, the jury is instructed to consider mitigating circumstances when deciding the penalty. Dr. Singer served as an expert witness concerning a defendant with extensive exposure to neurotoxic substances who committed multiple murders in one night (State of Missouri versus DeLong). DeLong faced the death penalty. Dr. Singer testified that toxic chemical poisoning altered DeLong's brain function, damaging his ability to think, plan, and control his impulses. After an extensive trial, the defendant was spared the death penalty due to mitigating circumstances, including neurotoxicity. 

This is the first case, to my knowledge, wherein neurotoxicity was a factor in mitigating the death penalty. Note that this legal issue was also reviewed by justices of the U.S. Supreme Court in 2016, who relied upon my work - see below.

2004: Consultations with United States House of Representatives Henry Waxman, chair of the committee (United States House Committee on Energy and Commerce) that has oversight over the United States Food and Drug Administration (FDA). The FDA was seeking legislation to allow them to severely restrict the sale of herbal supplements because herbal supplement manufacturers were allegedly making unscientific health claims and that consumers were being injured from taking herbal supplements.

Congressman Waxman consulted with me and my colleagues, and we informed Congressman Waxman that, generally speaking, herbal medicine as marketed in the United States was generally safe and, at times effective. Congress decided to continue to allow the sale of herbal supplements without requiring FDA approval. In a compromise with the FDA, herbal supplement manufacturers label the products with the following language:

"This statement has not been evaluated by the FDA. This product is not intended to diagnose, treat, cure, or prevent any disease."

In contrast to the beliefs of the FDA, USA citizens do believe that herbal products can treat or prevent disease, but this legal language was a necessary compromise for the continued sale of herbal products. As of 2015, most U.S. adults—68 percent—take dietary supplements, and consumer confidence remains high, with 84 percent of U.S. adults expressing overall confidence in dietary supplements' safety, quality, and effectiveness.

This compromise permitted the growth of the U.S. herbal supplement market to a forecasted $87 billion in 2022.

2004: Elected as a Fellow of the National Academy of Neuropsychology for "significant contributions to the Science and Profession of Neuropsychology," awarded to approximately only 213 neuropsychologists globally at that time.

2004: Diplomate in Neuropsychology with Added Qualification in Forensic Neuropsychology, American Board of Professional Neuropsychology (only 12 such certifications had been awarded worldwide at that time).

2008: In a U.S. Veterans Administration appeals decision, Citation Nr: 0800354 Decision Date: 01/04/08,  Archive Date: 01/22/08  DOCKET NO.  05-34 988, I was able to demonstrate that a claimant had a brain injury from a traumatic brain injury and subsequent electroconvulsive treatment that rendered him disabled. The veteran previously had been variously diagnosed with atypical somatoform disorder or schizophrenia. The veteran's claims of entitlement to service connection for a psychiatric disorder and residuals of a head injury were last denied by the VA in a September 1994 Board decision. That denial occurred 14 years before my work in the case, which resulted in a decision that the veteran was indeed disabled from his service.

A quotation from the decision:

"Also of record is a neuropsychological assessment of Dr. Singer dated in August 2005. This assessment notes the veteran's history of in-service head injury and subsequent discharge due to apparent schizophrenia. After a thorough evaluation, Dr. Singer concluded that it was unlikely that the veteran had schizophrenia after his discharge, although he did believe that the veteran had some brain dysfunction. He further stated that the veteran did not then currently have schizophrenia and related schizophrenic-like conditions to traumatic brain injury. Ultimately, Dr. Singer diagnosed organic brain dysfunction, affecting cognition, memory, and other brain functions, from a traumatic brain injury and electroconvulsive treatment...

Service connection is granted for disability resulting from disease or injury incurred or aggravated in active military service...Entitlement to service connection for residuals of a head injury is granted."

2009: Dr. Singer served as an expert witness in the State of Washington versus Zamora. Mr. Zamora faced the death penalty for a rampage of multiple murders, including tragically a police officer and random motorists. Dr. Singer examined the defendant, studied the case extensively, then wrote a report and expressed his opinion that neurotoxicity from substances including mold mycotoxins had altered Zamora's brain function and damaged his ability to think, plan and control his impulses. The case was settled without a trial, and the defendant was spared the death penalty.

Washington state agreed to pay $9 million to settle claims that this fatal shooting rampage could have been prevented. These tragedies could be prevented if mental health professionals and other medical providers were more aware of the mental health consequences of neurotoxicity. What will it take to bring neurotoxicity to its proper level of awareness among our medical and political leaders?

2009: Appellate decision: Dr. Singer served as an expert witness in a neurotoxicity case at the appellate level, wherein the appeals court judge accepted my opinion, overturned the lower Court, and concluded that the claimant's injuries included chemical sensitivity, as well as toxic encephalopathy. In Washington State Board of Industrial Appeals Re: Steven Vaughn. Before the Board of Industrial Insurance Appeals, State of Washington in Re: Steven R. Vaughn Docket No. 10 12284 Claim No. Y-965493 

2009: Appellate decision: Dr. Singer served as an expert witness in a British Columbia Worker's Compensation Appeals Tribunal (Re: Paul Whitehead). The Appeals Tribunal in an 83-page decision accepted my opinion that mercury-related neurotoxicity significantly injured a worker and that the worker was eligible for compensation.

2009: Daubert-type decision: On May 5, 2009, the Court in Nicole Alexander et al. vs. Bozeman Motors, Inc., Montana 19th Judicial District Court, Gallatin, County, Cause No. DV-05-699, ruled that my testimony was based on "time-tested use of scientific methodology in the neurotoxicity field", and that the field of neurotoxicity in which I engage is reliable.


2010: Dr. Singer served as an expert witness in the State of Washington Industrial Insurance Appeals Court, wherein the judge reversed the lower court ruling, characterized Dr. Singer as highly qualified, and accepted his opinion that the worker was injured from her work at the Hanford Nuclear Reservation (Re: Diana Gegg).

This decision was later affirmed by a higher court, which stated: "We strongly agree with our industrial appeals judge's decision to allow this claim... Based on the evidence in our record, we have concluded that all of the five diagnoses made by Raymond M. Singer, Ph.D., are correct and we have ordered the Department to allow the claim for these conditions". Read More Here

2010: Authored an updated chapter on Forensic Neurotoxicology - Singer, R. (2010): Forensic neurotoxicology. In the Handbook of Forensic Neuropsychology, Second Edition. New York: Springer.

2011: Authored one of the first published works identifying neurotoxicity as a specific syndrome - The Neurotoxicity Syndrome - in Singer, R. (2011). Neurotoxicity in Neuropsychology. In Schoenberg, MR & Scott, JG. The Little Black Book of Neuropsychology: a Syndrome Based Approach. New York: Springer.

2013: Dr. Singer began his work with USA Marine veterans in their quest for compensation for neurotoxic injuries from solvent-contaminated drinking water at Camp Lejeune, including several cases that had been on appeal. Since that time, neurobehavioral effects are now recognized by the Veterans Administration as potential outcomes of the contamination. Dr. Singer's identification since 2013 of neurotoxic injuries from the polluted water has been confirmed in a 2023 research article entitled: "Risk of Parkinson Disease Among Service Members at Marine Corps Base Camp Lejeune" published May 2023 in the Journal of the American Medical Association. From the article:

"Findings:  This cohort study of 340,489 service members found that the risk of Parkinson disease was 70% higher in Camp Lejeune veterans compared with veterans stationed at a Marine Corps base where water was not contaminated. In veterans without Parkinson disease, risk was also significantly higher for several prodromal features of Parkinson disease.

Meaning:  The study’s findings suggest that exposure to trichloroethylene in water may increase the risk of Parkinson disease; millions worldwide have been and continue to be exposed to this ubiquitous environmental contaminant."

2013: Served as an expert witness in a California case of a bystander injured by a commercial product being applied by other workers. The product contained toluene diisocyanate (TDI). This substance is known to be a respiratory toxicant, but its neurotoxic effects are less well known.

After days of deposition cross-examination, wherein Dr. Singer explained the neurotoxicity of toluene diisocyanate, he was informed that the manufacturer had altered the instructions on the product so that the product could be more safely applied. This was a gratifying and immediate effect of his testimony, with the implementation of product application guidelines that better protect workers - and bystanders  - from avoidable hazards when applying this product.

After this grueling and thorough deposition,  the defendants generously settled the litigation.

2015: The Veteran's Administration now recognizes that Agent Orange can cause peripheral neuropathy in veterans. However, this condition was known by Dr. Singer and his co-workers to be caused by Agent Orange at least since 1982. His testimony in the Agent Orange Vietnam Veteran's case in 1983 utilized research he had conducted and published which showed the peripheral neurotoxicity of Agent Orange (Singer, R., Moses, M., Valciukas, J., Lilis, R., & Selikoff, I. J. (1982). Nerve conduction velocity studies of workers employed in the manufacture of phenoxy herbicides. Environmental Research, 29, 297-311).

Sometimes it takes quite a bit of time, in this case, more than 30 years, for neurotoxicity to be acknowledged by authorities.

2015: Served as an expert witness in a case regarding the neurotoxic effect of mold. As is typical in most litigation, the defense tried to have his testimony excluded, but the judge ordered his testimony to proceed. The case was then settled, without the need for depositions or trial.

2017: For those new to toxic chemical litigation, you may not know that the right of a plaintiff to present expert witnesses to a jury can be prevented. Defendants in toxic chemical litigation will routinely attempt to have expert testimony excluded so that a jury is prevented from learning of evidence that could be beneficial to the plaintiff.

This tactic was attempted in 2017 in an Ohio state case, Crist v Columbia Gas et al.. However, this attack failed. The judge wrote: "Consistent with the holding in Shilling, this Court finds that Dr. Singer's testimony, in this case, meets the test of Evid.R. 702."

Federal Rules of Evidence, Evid. R. Rule 702. Testimony by Expert Witnesses

A witness who is qualified as an expert by knowledge, skill, experience, training, or education may testify in the form of an opinion or otherwise if:
(a) the expert's scientific, technical, or other specialized knowledge will help the trier of fact to understand the evidence or to determine a fact in issue;
(b) the testimony is based on sufficient facts or data;
(c) the testimony is the product of reliable principles and methods; and
(d) the expert has reliably applied the principles and methods to the facts of the case

2018: Served as an expert neuropsychologist/neurotoxicologist regarding a Camp LeJeune veteran. In part based on Dr. Singer's neuropsychological/ neurotoxicological assessment, the veteran was awarded 100% disability compensation for a relatively late-onset neurocognitive disorder resulting from exposure to water-borne solvents many years ago. (Department of Veterans Affairs, Veterans Benefits Administration, Regional Office, VA File Number 551 08 5206).

2018: Served as an expert neuropsychologist/neurotoxicologist regarding a neuropsychological injury from a prescribed psychiatric drug. In part based on Dr. Singer's neuropsychological/ neurotoxicological assessment, the claimant was awarded 100% disability compensation.

2018: Appellate decision: Served as an expert witness in a difficult appeals case presented to the British Columbia Workers' Compensation Appeal Tribunal (WCAT). (Decision of the Workers' Compensation Appeal Tribunal, WCAT Decision Date: August 28, 2018, WCAT Decision Number: A1701400).

The case was originally tried in 2015. Compensation for central nervous system dysfunction from solvent exposure in the claimant had been previously denied three times.

In 2018, Dr. Singer examined the claimant and reported his findings to the Court. He addressed the issues: does the claimant suffer central nervous system dysfunction from solvent exposures, as well as multiple chemical sensitivity (MCS)?

In an August 28, 2018 decision, the Appeals judge wrote: 

"I am satisfied, for the reasons given, that resolution of this issue is most appropriately based on Dr. Singer's interpretation of Dr. G's neuropsychological testing results. With the benefit of this new evidence, I find that the worker has likely sustained permanent cognitive impairment from his exposure to organic solvents, and this impairment is consistent with his WHO Type II CSE diagnosis."

"Dr. Singer concluded that in terms of a forensic opinion, within reasonable scientific, neuropsychological, neurotoxicological, and professional certainty, the worker was suffering from multiple chemical sensitivity (MCS), which was an "effect" of his prior occupational exposures that had resulted in neurotoxicity...  I rely on the opinions of Drs. H and Singer to find it likely that the worker's prior over-exposure to organic solvents and other toxic chemicals is of causative significance to his MCS." 

2019: I was informed that United States Supreme Court Justices Sotomayor and Ginsburg relied upon my work on neurotoxic causes of mental illness and crime. They authored an opinion regarding a case where I had provided expert services and cited my work ( ).

Their opinion was cited at least 4 times as of 2022, including two U.S. Federal Court of Appeals decisions. Seven further cases were based on the cited rulings.,AFD/CLARK+ELMORE+v.+DONALD+R.+HOLBROOK%2C+SUPERINTENDENT%2C+WASHINGTON+STATE+PENITENTIARY(2016)/vid/888666655/cited_by/jurisdiction:US+aplica_ley:888666655/*/by_score

2019: EPA Bans Consumer Sales of Methylene Chloride Paint Removers, Protecting Public on 03/15/2019 (

It's about time. In approximately 1996, I testified regarding the devastating neurotoxic effects of methylene chloride on an individual consumer. It can be dangerous to consumers even in outdoor exposures, depending upon various conditions. It should not be sold to the average consumer.

It took more than 20 years for US EPA to opine:

"In today's final rule, EPA found risks to consumers to be unreasonable. Acute (short-term) exposures to methylene chloride fumes can rapidly cause dizziness, loss of consciousness, and death due to nervous system depression. People have died after being incapacitated during paint and coating removal with methylene chloride. A variety of effective, less harmful substitutes [is] readily available for paint removal."

2019: Regarding an appellate decision concerning Camp LeJeune water contamination affecting US Armed Forces regarding a soldier who had late-onset neurological dysfunction.

Over the decades that I have issued forensic reports and testified in significant legal cases, several of the most gratifying cases involved cases that had previously been in the courts for years without resolution - - until my intervention or testimony. 

In a February 26, 2019, decision by the United States of America Board of Veterans Appeals, Department of Veterans Affairs, regarding an appeal by Donald M. Pach (Docket No. 18-07 093), the Board found that my opinion helped them resolve “all reasonable doubt” that the veteran was indeed disabled by his exposure to contaminated water while serving in the military.

Details of that case:

After being denied recognition of his work-related disability by a lower court for an injury from the veteran's exposure to neurotoxicants at Marine Corp Base Camp Lejeune, the appeals court heard the veteran’s appeal for compensation. The veteran had been previously examined at the Mayo Clinic and by other neurologic providers.

The appellate court overturned the previous denial of the veteran's benefits and awarded benefits based substantially on my report and opinion.

The judge wrote: "The most probative [meaning most competent and credible] opinion is a January 2018 opinion by Dr. R. Singer (a neurotoxicologist, Ph.D.) ... This opinion of a doctor specializing in neuropsychology and trained in toxicology that it is as likely as not that the Veteran's disability is causally related to his service - and specifically to his presumed exposure to contaminated water while stationed at Camp Lejeune - is highly probative evidence supporting the claim. There certainly is no equally probative medical opinion to the contrary, so this claim must be granted."

This positive case resolution is a further advancement of the profession of applied neurotoxicology and neuropsychology in the legal arena.

This case is another example of what I term the neurotoxic ramifications of modern warfare. There are numerous examples of this aspect of modern warfare, including cases in which I have participated, such as the Agent Orange Vietnam Veteran's litigation and the multifarious contamination of the Hanford Nuclear Works affecting today's workers. In addition, veterans whose brains have been damaged by military-related neurotoxicants are at risk of committing serious - even capital - criminal offenses while unwittingly suffering the effects of neuropsychological disorders from military neurotoxicity. I have served as an expert witness in such a case (Arizona State versus Robinson, 2016).

2022: Identified and testified in court that psychiatric drugs under some conditions and circumstances can alter personality to the extent that a psychiatric patient under drug treatment may unwittingly commit homicide. This finding emphasizes the importance of regular monitoring of drug administration to psychiatric patients for worsening symptoms - - and cautions against increasing dosages or rapid switching of psychiatric drug prescriptions. Both medical procedures can critically worsen a patient's psychiatric condition, which can result in acts of violence and other criminal offenses.

2022: I have taught since the 1990s that neurotoxicity can cause practically any neurologic, psychiatric, and neuropsychological illness. This hypothesis has been supported (again, but 30 years later) in a 2022 review article, that found: "Environmental attributes [toxic substances] have been regarded as the main contributors to neural dysfunction-related disorders. The majority of neurological diseases [emphasis mine] are mainly related to prenatal and postnatal exposure to industrially produced environmental toxins. Some neurotoxic metals, like lead (Pb), aluminium (Al), Mercury (Hg), manganese (Mn), cadmium (Cd), and arsenic (As), and also pesticides and metal-based nanoparticles, have been implicated in Parkinson’s and Alzheimer’s disease."Quoted from Vellingiri, B., Chandrasekhar, M., Sri Sabari, S., Gopalakrishnan, A. V., Narayanasamy, A., Venkatesan, D., Iyer, M., Kesari, K., & Dey, A. (2022). Neurotoxicity of pesticides – A link to neurodegeneration. Ecotoxicology and Environmental Safety, 243, 113972.

2022: 20–60% of patients with psychiatric disorders do not respond to drug treatment. Howes, O.D., Thase, M.E. & Pillinger, T. Treatment resistance in psychiatry: state of the art and new directions. Mol Psychiatry 27, 58–72 (2022).

I  have found that people affected by neurotoxicity who develop psychiatric disorders typically do not respond to psychiatric drugs. A significant segment of the 20-60% of patients may be actually suffering from neurotoxicity and are being treated inappropriately.

2023: The Neurotoxicity Guidebook, which I first published in 1990, is still in print and selling new copies. I am gratified that the text is still informative 32 years after first published.

2024: According to Research, as of May 2024 my published scientific work has been cited 264 times in peer-reviewed journals.