Roger Breton

Senior Scientist

Ottawa, Ontario

Email: moc.k1569010495isnir1569010495tni@n1569010495oterb1569010495r1569010495
Phone: +1 613-761-1464 Ext. 224
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Roger Breton is a Senior Scientist at Intrinsik Corp. and has over 25 years of experience in ecological risk assessment (ERA) including exposure and effects assessments for aquatic and wildlife species exposed to commercial chemicals, pesticides and other environmental contaminants. Roger has led, managed or participated in refined ecological risk assessments for numerous pesticides including brodifacoum, chlorothalonil, simazine, atrazine, aldicarb, chlorpyrifos, azinphos-methyl, bifenthrin, permethrin, methomyl, tefluthrin, fluoxypyr, pendimethalin, trichlorfon, malathion, dimethoate, quintozene and others.  The pesticide assessments involved registration or re-registration including expert support for the registrant when dealing with the Pest Management Regulatory Agency in Canada or the US Environmental Protection Agency. In some cases the risk assessments were developed to support legal cases, particularly endangered species assessments. Most of the risk assessments involved probabilistic exposure and effects methods to determine the magnitude of risk to ecological receptors. Roger was involved in conducting probabilistic ecological risk assessment of several contaminated sites including the Housatonic River and the Calcasieu Estuary Superfund sites in the United States. He led the development of the exposure, effects and risk characterizations for piscivorous, omnivorous and carnivorous mammals. Previously he worked in the Existing Substances Branch of Environment Canada for 11 years where he managed or co-lead assessments for commercial chemicals that were included on the Priority Substances List and the Categorization and Screening of the Domestic Substances List (CSDSL). The CSDSL involved assessing the persistence, bioaccumulation and the toxicity of nearly 23,000 substances on the DSL. Roger is very familiar with Canada’s Chemicals Management Plan (CMP). He is a peer reviewer for many screening-level risk assessments conducted under the CMP.  He has developed state-of-the-science reports for Environment Canada on methods to assess the persistence and bioaccumulation potential of chemicals. He also developed criteria for various organizations to assess the quality and relevance of ecotoxicity studies including fish, aquatic invertebrates and plants, birds and mammals. He has evaluated hundreds of studies with these criteria. Roger participated in the SETAC Pellston Workshop on improving the usability of ecotoxicity studies in regulatory decision-making.

Experience Highlights

  • Managed endangered species assessments and Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA) re-registrations of pesticides.
  • Led ecological risk assessments for re-registration of pesticides under Canada’s Pest Control Products Act.
  • Has led risk assessments and provided risk mitigation measures to reduce risk to biota from exposure to pesticides.
  • Specializes in aquatic and wildlife risk assessment.
  • Led numerous high-profile risk assessment and environmental toxicology projects across Canada and the United States for pesticides and commercial chemicals.
  • Very familiar with Canada’s existing and new chemicals assessment program.
  • Led wildlife risk assessments for contaminated sites.
  • Called upon to provide peer review services for other consulting firms, industry and government agencies.

Education and Professional Qualifications

  • M.Sc., Chemistry, University of Ottawa
  • B.Sc., Biology, University of Ottawa

Professional Affiliations

  • American Chemical Society
  • Society of Environmental Toxicology and Chemistry


Join Our Team

Intrinsik Corp., is a dynamic science-based consulting firm.  We are eagerly interested in professionals to add to our accredited staff base.  Intrinsik is strongly committed to our employees by ensuring mentoring, training and advancement for those with a drive to succeed.  Our areas of expertise include and are not limited to toxicology, human health and environmental risk assessment, biology, multi-media exposure modeling, environmental science, and risk management.

Diversity is not only part of our company’s culture, it is a core business strategy.  We are building a workforce that is representative of our society, and our programs and policies are designed to foster diversity and inclusion.

AODA Declaration
Our goal is to create an environment that is inclusive to all members of the community.  Intrinsik Corp., focuses on identifying, removing, and preventing barriers for persons with disabilities, and our policy complies with the Accessibility for Ontarians with Disabilities Act, 2005 (AODA).

How Can We Help?

Our scientists have the expertise to address your complex
toxicological health and environmental issues, including product
development and business risks to avoid scientific and regulatory delays.

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