Peterson Gradient - Peterson
Gradient

Principals

Michael K. Peterson, M.E.M., DABT
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Education

M.E.M., Environmental Toxicology and Risk Assessment, Duke University

B.S., Chemistry and Environmental Science, Bradley University

Diplomate of the American Board of Toxicology

Expertise

  • Occupational Health
  • Product Safety
  • Human Health Risk Assessment
  • Applied Toxicology

Michael K. Peterson, M.E.M., DABT

Principal

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Mr. Peterson is a Principal at Gradient more than 20 years of experience specializing in human health risk assessment of cancer and non-cancer endpoints, critical analysis of human and animal toxicology and epidemiology studies, and multimedia assessment of exposure to chemicals.  He has applied these skills primarily in the areas of product safety, occupational safety and health, and risk assessment.  He has extensive experience evaluating the toxicity of asbestos and other fibers.  He also has experience evaluating exposures to chemicals in a variety of different consumer products, and developing toxicity guidelines for those chemicals.  Many of his projects have involved preparing risk communication materials to effectively convey chemical exposure risks in appropriate context for a variety of stakeholders.  He is an appointed member of the Washington Governor's Industrial Safety and Health Advisory Board, the President of the Occupational and Public Health Specialty Section of the Society of Toxicology, and the Chairperson of the Washington Agriculture Safety Day Committee.  While earning a Masters of Environmental Management degree at Duke University, Mr. Peterson researched the oral bioavailability of polycyclic aromatic hydrocarbons from soil.

Education

M.E.M., Environmental Toxicology and Risk Assessment, Duke University

B.S., Chemistry and Environmental Science, Bradley University

Diplomate of the American Board of Toxicology

Expertise

  • Occupational Health
  • Product Safety
  • Human Health Risk Assessment
  • Applied Toxicology

Services

Representative Projects

Proposition 65 Surrogate Safe Harbor Limit (SHL) Derivation:  Developed surrogate Proposition 65 SHLs for a number of listed chemicals without official regulatory values.  SHLs were developed using a variety of techniques, including literature reviews, conversion of guideline values from other safety and health organizations, and benchmark dose modeling of primary toxicology studies.  The resulting SHLs were used by the client to determine whether or not products were in compliance with Proposition 65.

Talc Product Weight of Evidence Evaluation: 
Conducted a weight of evidence causal evaluation and risk assessment for exposure cosmetic talc and any potential impurities in consumer products.  Synthesized data from animal, epidemiology, and mechanistic studies and determined whether the evidence supported a causal association between exposure to talc and mesothelioma, lung cancer, and ovarian cancer.

Synthetic Turf Recycled Rubber Risk Assessment and Science Communication
: Prepared a multipathway human health risk assessment related to potential chemical exposures for athletes and spectators using synthetic turf fields.  The results of the assessment were used to prepare risk science communication pieces to present the results to interested stakeholders.

Asbestos Containing Product Evaluation:  Conducted a weight of evidence causal evaluation and risk assessment for exposure to asbestos from a electrical product.  Evaluated the industrial hygiene, toxicological, and epidemiological data related to asbestos and determined whether or not potential health effects would be expected.

Nanomaterial Safety Assessment:  Used current literature to develop state-of-the-science techniques for evaluating worker risks and exposures to engineered and other nanoparticles.  The end goal was the development of an appropriate strategy for managing environmental health and safety risks associated with nanomaterials, including the development of guideline levels for these materials and exposure assessment methodologies.

Selected Publications

Peterson, MK; Mohar, I; Lam, T; Cook, TJ; Lynch, HN; Engel, AM.  2019. "Critical review of the evidence for a causal association between exposure to asbestos and esophageal cancer." Crit. Rev. Toxicol. 49 : 597-613.

Peterson, MK; Lemay, JC; Pacheco Shubin, S; Prueitt, RL.  2018. "Comprehensive multipathway risk assessment of chemicals associated with recycled ("crumb") rubber in synthetic turf fields." Environ. Res. 160 : 256-268.

Goodman, JE; Peterson, MK; Hixon, ML; Pacheco Shubin, S.  2017. "Derivation of an oral maximum allowable dose level for bisphenol A." Regul. Toxicol. Pharmacol. 86 : 312-318.

Lewandowski, TA; Peterson, MK; Charnley, G.  2015. "Iodine supplementation and drinking-water perchlorate mitigation." Food Chem. Toxicol. 80 : 261-270.

Goodman, JE; Peterson, MK; Bailey, LA; Kerper, LE; Dodge, DG.  2014. "Electricians' chrysotile asbestos exposure from electrical products and risks of mesothelioma and lung cancer." Regul. Toxicol. Pharmacol. 68 : 8-15.

See All Michael Peterson Publications