All substances are potentially harmful.  It is the dose that makes the poison.

Valid decisions in science are based upon strong, specific, and consistent evidence.

Human health risk assessment is a tool designed to protect; the methodology is not designed to predict the probability of actual harm.

Sound science makes  for sound decisions. It is based on good quality studies and well considered logic.

The puzzles of science often present us with pieces that seem to fit together. Formulating the most relevant and refined research questions is often the key to establishing whether or not the fit is true.

Some physicians rely on news media for information about possible health effects of chemicals. Some diagnose chemical injuries without proper confirmatory research.

Integrated toxicology research can distinguish the known/likely answers from the unknown/improbable answers.


Dr. Brent Kerger provides optimized research capabilities in environmental chemistry, toxicology, and risk assessment for clients with scientific questions in the regulatory or legal arenas. Brent has the multidisciplinary experience and both internal and external expert resources to implement focused research activities to answer key questions about chemical exposures and health consequences in humans. 


Dr. Kerger's mission is to provide high quality, cost-effective research that can be communicated clearly.


Exponent Inc.
320 Goddard, Suite 200
Irvine, CA 92618
Phone: (949) 242-6046
Fax: (949) 242-6099
Cell: (850) 508-2893


Chemical Expertise

Polychlorinated Dioxins, Furans and Biphenyls
Heavy Metals (e.g., Chromium, Lead, Arsenic, Beryllium)
Asbestos-Containing Materials
Irritant gases (diacetyl, formaldehyde, hydrogen sulfide, mercaptans)
Drugs and Medical Devices
Petroleum Hydrocarbons (e.g., Benzene, Toluene, PAHs)
Chlorinated Solvents (e.g., trihalomethanes, trichloroethylene, perchloroethylene)
Pesticides (e.g., Organophosphates, DDT, Cyclodienes, 2,4-D & 2,4,5-T)
Bioaerosols (e.g., Molds & Mycotoxins)
Inorganic dusts (e.g., silica, talc)

Technical Expertise

Evidence-Based Disease Causation Analysis
Multi-disciplinary Research in Toxicology and Exposure Assessment
Experimental Design to Reconstruct Chemical Exposure and Dose
Human Health and Ecological Risk Assessment
Toxicology and Medical Literature Research
Risk-Based Sampling Design
Hazard Communication
Toxic Tort Scientific Issue Research and Expert Witness
Weight of Evidence and Disease Causation Analysis
Independent Third Party Review of Scientific Issues


Bachelor of Science in Chemistry, Florida State University, 1983
Doctorate in Interdisciplinary Toxicology, University of Arkansas for Medical Sciences, 1988
Diplomate of the American Board of Toxicology, Certified in General Toxicology, 1994-Present

Professional Society Affiliations

Member in Society for Risk Analysis, 1988 – Present
Associate Member in Society of Toxicology, 1986 – 1998
Full Member in Society of Toxicology, 1998-Present
Member in International Society for Exposure Analysis, 1997-present

Peer Review Activity

Environmental Health Perspectives
Journal of Toxicology and Environmental Health
Toxicological Sciences
Regulatory Toxicology and Pharmacology
Risk Analysis
Journal of Exposure Science and Environmental Epidemiology
Journal of Children’s Health
Atmospheric Environment
Human and Ecological Risk Assessment
BioMedCentral Public Health: Associate Editor

Record of Employment

2014-Present, Principal Scientist, Exponent Inc.
2012-2014 Senior Principal Health Scientist, ChemRisk LLC
1997-2011, Director of Health Science Resource Integration [HSRI]
1997, Managing Principal Health Scientist, ChemRisk Division of McLaren/Hart Environmental Engineering
1995-1997, Principal Health Scientist, ChemRisk Division of McLaren/Hart Environmental Engineering
1993-1995, Supervising Health Scientist, ChemRisk Division of McLaren/Hart Environmental Engineering
1992-1993, Senior Health Scientist, ChemRisk Division of McLaren/Hart Environmental Engineering
1988-1992, Senior Toxicologist, Toxicological Evaluations, Research and Risk Assessment (TERRA, Inc.)
1985-1988, Research Assistantship, University of Arkansas for Medical Sciences, Division of Interdisciplinary Toxicology
1983-1986, Research Chemist, Department of Biological Sciences, Florida State University
1983, Chemist, Water Resources Division, Florida Department of Environmental Regulation
1981-1983, Undergraduate Researcher, Analytical Chemistry Department, Florida State University
1980-1981, Quality Control Chemist, Winter Garden Citrus Products Cooperative, Ocoee, Florida

Brent is a board-certified toxicologist with over 32 years of experience in toxicology, environmental chemistry, risk assessment, disease causation analysis, and hazard communication.

For over 24 years he has helped clients by researching science questions raised in regulatory or legal arenas.

He has published thorough literature reviews and original research (field, lab & clinical) on exposure/risk and disease causation issues for a wide variety of chemicals, drugs, and other hazardous agents.

Dr. Kerger's research publications cover a wide variety of chemicals and toxicology or epidemiology issues important to assessing worker safety and public health.

Dr. Kerger's research has focused on persistent chemicals often found at trace levels in foods, water, and other consumer products.

Health concerns can be based upon faulty logic or weak science.  Revealing such faults and arriving at the most plausible scientific answers is rarely a simple task.


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