Professor Emeritus, Board Certified Toxicologist, PhD in Microbiology
Expert Witness and Consult in the Life Sciences


Intelligence guided by experience- doing a task well is efficient;
doing the right task well is effective.

  • Specializing in complex multidisciplinary cases
  • Reports documented with references
  • Medical causation
  • Mechanisms of disease
  • Risk assessment
  • Assistance with cross-examination of other experts
  • Explanation of case science to juries
  • Serving as a master for judges


Professor Emeritus, University of Missouri, Columbia, MO; Dalton Cardiovascular Research Center, the Graduate School; Department of Molecular Microbiology and Immunology, School of Medicine; Dept. of Biomedical Sciences and Adjunct Professor of Pathology, College of Veterinary Medicine.


Tel: 573-449-7444
BrownO@missouri.edu and dr.olen.brown@gmail.com

  • Microbiology PhD , University of Oklahoma.
  • Board CertifiedDiplomate in Toxicology, 1989 - present (Member Standards of Knowledge Committee).
  • Fellow in Chemistry and Chemical Engineering, American Association of Chemists.
  • Broad teaching and research experience in the Life Sciences focusing on Human Medicine using the disciplines of bacteriology, virology, immunology, epidemiology, biochemistry, physiology, analytical chemistry, toxicology,epidemiology and environmental sciences.
  • Consulting and Peer Review extensively with the EPA, Superfund, NIH, NIEHS, ATSDR, AAAS, and others.
  • Listed in American Men and Women of Science; Marquis Who's Who in the World and in America; and others.
  • Over $6,500,000 in federal research grants, and over 200 scientific publications.
  • Stress mechanisms of toxicity, including oxygen free radical biology and chemistry for various diseases of the brain (Parkinson's, Alzheimer's) and lung (COPD, RADS, Asthma), premature infant oxygen therapy, and various therapeutics.
  • Author, The Art and Science of Expert Witnessing , Cypress Publishing Group, 2002; Miracles, BookSurge Publishing, 2007 (revised 2020); The Art and Science of Poisons and Oxygen, the Breath of Life: boon and bane in human health, disease and therapy, Bentham Science Publishers, LtD.
  • Publications, More than 200, including the most recent, a review as a Preprint: Asymptomatic COVID-19: we don’t know what we don’t know
  • Professorships, teaching and research appointments in: Molecular Microbiology and Immunology, School of Medicine; Biomedical Sciences, College of Veterinary Medicine; and John M. Dalton Cardiovascular Research Center, University of Missouri, Columbia.
  • A 40+ page resume, including a list of attorneys I have assisted, is available via e-mail.

Scientific expert witnessing and consulting broadly in the Life Sciences, including: Toxicology (academic, general, forensic, pharmaceutical and governmental); safety review of medical devices and therapeutics; white papers; risk assessment; review of medical records for cause-and-effect; medical writing; and serving trial judges as a master.


Expert witness, defense/plaintiff, civil/criminal; as a pre-trial consultant and disclosed for depositions affidavits, and trials. Hired for 250+ cases in 26 states plus Canada and Bahamas; 37 depositions and 20 trials including for Mound, Cotton, Wollan & Greenglass, Manhattan, NYC; Fulbright and Jaworski, Houston; Shook Hardy and Bacon, KC; Faust Goetz  Schenker & Blee, Manhattan, NY; Ford Parshall and Baker, Columbia, MO; Goldstein and Price, St. Louis; Helfrey Simon and  Jones, St. Louis; Rosenblum, Schwartz & Fry, St. Louis; Peddicord & Townsend, KC; London Fisher, Irivin, CA.

  • Evaluating the scientific merit of complex cases requiring broad knowledge and experience.
  • Cause-and-effect relationships for chronic and acute exposures to environmental and workplace chemicals including asbestos, benzene and other solvents, metals (lead, zinc, manganese), particulates, dusts and gases, and most organic and inorganic chemicals.
  • Infectious diseases , antibiotic therapy, mold exposure (allergic reactions and infections- histoplasmosis, blastomycosis), epidemiology, immunology.
  • Environmental spills and contaminations (air, water, soil); examples: LUST, gasoline, diesel, PAH. 
  • Alleged pesticide (herbicide, rodenticide, biocide) drift and/or misuse.
  • Alcohol and illicit and ethical drug impairment (including criminal).
  • Serving as an Independent Master at trial for Judges for complex, scientific issues.
  • The White House, unpaid consultant for Carlton Turner, Director, Drug Abuse Policy Office for President Ronald Reagan, relative to Marijuana, 1982.
  • Consultant for Corporations and Universities,1981 to present. Consultant for Guideline; Douglas Peterson, Inc.; Reuters; Gerson Lehman; The Round Table Group; The Science Advisory Board; Thompson West; IMS Expert Services; Martindale; and Eastern Research Group.
  • Invited Reviewer for the American Association for the Advancement of Science: 62 books and films.
  • Invited Test Item Writer: MCAT and ACT, medical school and college admission tests, 1990-91 and 1992.
  • Invited Judge: Research & Development Magazine's 100 Awards, 1996, 1999; and annually for the past 10 years, judge for acceptability of abstracts submitted by scientists for the Annual Meeting of the Society of Free Radical Biology and Medicine.
  • Peer Reviewer for Superfund Research for NIEHS: 1990-1991, 1994, 1999, 2004, 2005.
  • Peer Reviewer for NIH, NIEHS, EPA, ATSDR and CDC for medically-related SCOR Projects and Grants: 1979, 1986, 1999; and for the EPA 1998, 1999-2000, 2003-2008, 2018 and for ATSDR (Agency for Toxic Substances and Disease Registry of the CDC); and HEAST (Health Effects Assessment Summary Tables); Toxicity Profiles (including cancer risk assessment, and acute, subchronic, and chronic toxicities and risk assessment documents for specific chemicals.
  • Peer Reviewsfor the Eastern Research Group, and the American Institute for Biological Sciences: 1997.
  • Peer Reviews for the US Army Medical Research & Material Command, Defense Department; Naval Medical Research; and Kansas DEPSCoR 2000: 1995-96 and 1997-1998.
  • Peer Reviewer for Scientific Journals: Peer Review: Proceedings of the National Academy of Science, Analytical Biochemistry, Environmental Health Perspectives, American Journal of Physiology, Heart and Circulatory Physiology, Archives of Biochemistry and Biophysics, Free Radical Biology and Medicine, Biochemical Letters, Chemical Research in Toxicology, International Journal of Biomedical Science, and others.
  • Editorial Boards: Biomedical Letters, The Faculty Press, Cambridge, England, 1991-1995; Cellbio; and Managing Editorial Board for Frontiers of Bioscience, an on-line Encyclopedia of Science and Medicine, 2003-.

Olen R. Brown, Ph.D., Professor Emeritus
527 North Cedar Lake Drive West
Columbia, MO 65203

Tel: 573-449-7444
Email: BrownO@missouri.edu and dr.olen.brown@gmail.com

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Updated November 2020