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Dennis Paustenbach, PhD, CIH, DABT, President


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Phone: (415) 618-3201
Fax: (415) 896-2444
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Location: Jackson Hole, WY



Dr. Dennis Paustenbach is a board-certified toxicologist and industrial hygienist with nearly 30 years of experience in risk assessment, environmental engineering, ecotoxicology, and occupational health. Currently he is the President of Cardno ChemRisk, a division of Cardno.  This division specializes in human and ecological risk assessment, as well as, risk analysis of chemical and radionuclides in consumer products, contaminated sites, pharmaceuticals and medical devices.

In 1985, he founded ChemRisk, formerly the nation’s largest human and ecological risk assessment group, at which time it was a joint venture with McLaren-Hart.  In 1996, he became President and Chief Executive Officer (CEO) of McLaren-Hart Environmental, a nationwide consulting firm of 600 persons (number 100 in the US at the time).  In 1997, he joined Exponent and was Vice President responsible for leading the Health Sciences division.  In 2003, he restarted ChemRisk as a separate enterprise which later merged with Cardno.

Dr. Paustenbach specializes in the areas of industrial and environmental toxicology, occupational health, historical state-of-knowledge regarding environmental issues, and ecological and human risk assessment and has also directed the scientific aspects of toxic tort cases. In addition, he has also provided expert witness testimony in public meetings and as many as 400 depositions and two dozen trials concerning the health effects of chemicals in sediments, air, soil, consumer products, groundwater, and the workplace. He has been an adjunct professor at five universities.

He has been an invited technical reviewer for prominent journals and of proposed regulations. Dennis has published approximately 300 peer-reviewed articles and written more than 50 book chapters in the fields of industrial hygiene, human and aquatic toxicology, engineering, and risk assessment. His two textbooks on risk assessment are among the most popular that have ever been published and they have been adopted by a number of universities in various countries.


  • Dr Eng, (Honorary), Rose-Hulman Institute of Technology, 2007
  • ScD, (Honorary), Purdue University, 2006
  • PhD, Environmental Toxicology, Purdue University, 1982
  • MS, Counseling Psychology, Indiana State University, (at night), 1978
  • MS, Industrial Hygiene (minor in toxicology), University of Michigan, 1977
  • BSChE, Chemical Engineering, Rose-Hulman Institute of Technology, 1974
  • Post-Doctoral Research (in absentia), Pharmacokinetics, Wright-Patterson Air Force Base, Dayton, OH; 1985-1987 (part-time) (collaborated with Dr. Melvin Andersen).
  • Visiting Scientist at the Harvard School of Public Health; Center for Risk Analysis; Boston, MA (1996-1997). A one-year appointment that included 10 weeks in residence at the college. Worked with Dr. John Graham.

Professional Associations

  • Society for Risk Analysis (SRA)
    • Council Member for National Organization (1998–2000)
    • Council Member of Northern California chapter (1995–1996)
  • American Industrial Hygiene Association (AIHA)
    • Member of Risk Assessment Committee (1995–1997)
    • Liaison representative between AIHA and the SRA (1991–1994)
    • Member of Toxicology Committee (1982–1984)
    • Member of Workplace Exposure Limits Committee (1982–1984)
    • Co-Chair of Committee on Unusual Workshifts (1981–1984)
    • President, Indiana Section (1981)
    • Member of Hygienic Guides Committee (1976)
    • American Conference of Governmental Industrial Hygienists (ACGIH)
  • Society of Toxicology (SOT)
    • President, Risk Assessment Specialty Section (2000)
    • Vice President elect, Risk Assessment Specialty Section (1998–2000)
    • Member of FAST 50th Anniversary Committee of SOT (2008-2011) [responsible for preparing documents, films, books and the party which was to memorialize the profession.
    • Assistant editor of the SOT 50th anniversary book describing the history of the Society of Toxicology. (2010)
  • Society of Environmental Toxicology and Chemistry (SETAC)
    • Associate Chairman of Organization Committee (2000)
    • International Society of Exposure Analysis (ISEA)
    • Member of Awards Committee (1999-2002)
    • Member of Executive Council (2002-2005)
    • International Society of Regulatory Toxicology and Pharmacology (ISRTP)
  • Air and Waste Management Association (AWMA)
  • New York Academy of Science (NYAS)
  • Sigma Xi (Stanford Chapter)

Awards/Professional Honors

  • Awarded 2014 Best Published Paper Regarding Medical Devices for Toxicology-based cancer causation analysis of CoCr-containing hip implants: a quantitative assessment of genotoxicity and tumorigenicity studies (J Appl Tox. 34(9):939-967).  Medical Device and Combination Product Specialty Section – Society of Toxicology Annual Meeting, San Diego, CA, March 2015. 
  • Nominated for the title of "Fellow" by the Society for Risk Analysis (2011)
  • Henry Smythe Award for contributions in toxicology to the field of occupational health, American Conference of Governmental Industrial Hygienists (ACGIH) (2010)
  • Ed Baier Award for significant contributions to the field of Industrial Hygiene, American Industrial Hygiene Association (AIHA) (2009)
  • Invited lecture at the International Conference on Risk Assessment, Switzerland (2009)
  • Awarded the title of "Fellow" by the American Industrial Hygiene Assoc (2009)
  • Honorary Doctor of Engineering (2007)
  • Honorary Doctor of Science (2006)
  • Society of Toxicology, Best Published Paper Award in Risk Assessment (2002)
  • Society of Toxicology, Arnold J. Lehman Award for Contributions to the Practice of Risk Assessment and Toxicology (2002)
  • Purdue University Distinguished Alumnus Award, School of Health Sciences (2000)
  • Society of Toxicology, Best Platform Presentation in Risk Assessment Award at the 39th Annual Meeting (2000)
  • Society for Risk Analysis Outstanding Risk Practitioner Award (1997)
  • Society of Toxicology, Best Published Paper Award in the Field of Risk Assessment (1995)
  • AwarRose-Hulman Institute of Technology, Distinguished Alumni Award (1994)
  • AIHA Kusnetz Award for "distinguished contributions to the field by a person under 40 years of age" (1992)
  • American Men and Women in Science (1993–present)
  • Who's Who in America (1993–present)
  • Who's Who in the Health Sciences (1994–present)
  • Health Sciences Honorary (Alpha Chi Omega) (1980)
  • Chemical Engineering Honorary (Omega Chi Epsilon) (1974)

Practice Areas

  • Crisis Management
  • Exposure Assessment and Dose Reconstruction
  • Health and Environmental Risk Assessment
  • Regulatory Support
  • Toxicology and Ecotoxicology
Tags: Sort Case Study by Practice Area: Crisis Management ,Exposure Assessment and Dose Reconstruction ,Health and Environmental Risk Assessment ,Regulatory Support ,Toxicology and Ecotoxicology
Locations: Jackson Hole, WY
Chemical or Material: 1,2-Benzisothiazolin-3-one ,2,4,5 Trichlorophenoxyacetic acid ,245-T ,Acetone ,Aldrin ,Aroclors ,Arsenic ,Asbestos ,Benzaldehyde ,Benzene ,Beryllium ,BIT ,BPA ,BTEX ,Butadiene ,Cadmium ,Carbon Monoxide ,Carbon Tetrachloride ,CCA ,Chlordane ,Chlorinated SolventsVOC ,Chlorine ,Chlorine Gas ,Chromium ,Chromium (III) ,Chromium (VI) ,Coal tar ,Coal Tar Creosoltes ,Coal Tar Pitch ,Coal Tar Pitch Volatiles ,Coal Tar Products ,Cobalt ,Copper ,Crystalline Silica ,Cyanoacrylates ,Cyclodiene Pesticide ,DBDPO ,DDT ,Decabromodiphenyl Oxide ,DEHP ,Di-(2-ethylhexyl) Phthalate (DEHP) ,Diacetyl ,dichlorodiphenyltrichloroethane ,Diesel exhaust ,Diesel fuel ,Diesel particulate ,Dioxane ,Divalent Nickel ,ethyl cyanoacrylate (ECA) ,Flame retardants ,Formalin ,H2S ,Halogenated Methanes ,Heptachlor ,Herbicides ,Hexavalent Chromium ,Hydrogen Sulfide ,Isoprene ,Isothiazolinone ,Lead ,Mercury ,Metals ,Methane ,Methanol ,Methoxyethanol ,Methyl Bromide ,Methyl Cyanoacrylate (MCA) ,Methyl Ethyl Ketone ,Methyl Mercury ,Methylene Bisphenyl Isocyanate ,Mold ,Nickel ,Nitroglycerin ,Nitrosamines ,Organochloro Pesticide ,PAHs ,Paraldehyde ,Particulate matter ,Particulates ,Pathogenic Mold ,PBDE ,PCB ,PCB Congeners ,PCE ,PCP ,Pentachlorophenol ,Perc ,Perchlorate ,Perchloroethene ,Perchloroethylene ,Perfluorinated Compounds ,Perfluorooctanoic Acid ,Pesticides ,Petroleum ,Petroleum Derived Solvents ,PFC ,PFOS ,Pharmaceuticals ,Phenol ,Phosphorous ,Phthalates ,PM ,PM10 ,PM2.5 ,Polychlorinated Biphenyls ,Polychlorinated Dibenzo-p-furan ,Polycyclic Aromatic Hydrocarbons ,Polynuclear Aromatic Hydrocarbons ,Radiation ,Radioisotopes ,Radionuclides ,Silica ,Styrene ,Sulfur Oxides ,Sulfur Trioxide ,Sulfuric Acid ,Talc ,TCE ,Toluene ,Toxic Mold ,Trivalent Chromium ,TWP ,Ultrafine Particulate
Sort Professionals by Practice Area: Crisis Management ,Exposure Assessment and Dose Reconstruction ,Health and Environmental Risk Assessment ,Regulatory Support ,Toxicology and Ecotoxicology


Rebecca Adams
Christy Barlow
Amanda Burns
Dallas Cowan
Brent Finley
Denise Hill
James Keenan
Michael Kovochich
Marisa Kreider
Amy Madl
Andy Monnot
Rachel Novick
Dennis Paustenbach
Angie Perez
Brooke Tvermoes

Key Services

  • Hazard assessments
  • Dose-response modeling and assessments
  • Physiologically Based Pharmacokinetic (PB-PK) modeling
  • Toxicology study design, management and interpretation
  • Structure activity relationships
  • Causation assessments and evaluations


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