• Intrinsik Science Inc. :: Science - Integrity - Knowledge
  • Intrinsik Science Inc. :: Science - Integrity - Knowledge
  • Intrinsik Science Inc. :: Science - Integrity - Knowledge
  • Intrinsik Science Inc. :: Science - Integrity - Knowledge
  • Intrinsik Science Inc. :: Science - Integrity - Knowledge

Donald Davies, Ph.D., DABT

Office: Calgary, Alberta
Position: Chairman and Senior Vice-President
Phone: +1 403 237-0275, ext. 233
Fax: +1 403 237-0291
Email: This e-mail address is being protected from spambots. You need JavaScript enabled to view it

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Dr. Donald Davies is the Chairman of the Board and a Principal of Intrinsik Inc. and a Senior Vice-President of Intrinsik Environmental Sciences Inc. He is a recognized authority in the areas of toxicology, health risk assessment and health risk communication, having spent more than 35 years studying the effects of chemicals on living systems. Dr. Davies’ experience extends to all aspects of toxicology and risk assessment, from the design, conduct and monitoring of toxicity studies, to the review and evaluation of toxicological data on a diversity of chemicals, to the assessment of the potential health risks associated with chemical exposures originating from a variety of industrial and non-industrial sources. He has led and contributed to literally hundreds of health risk assessments, and has authored numerous reports and publications detailing his work.

During his career, he has studied the health effects of a number of different categories of chemicals, including commodity and specialty products, plastics and resins, pesticides, fertilizers, incidental food additives as well as volatile organic compounds (VOCs), products of incomplete combustion (PICs), criteria air contaminants (CACs), heavy metals and a host of other environmental contaminants. Based in Calgary, Alberta, Dr. Davies also is highly-versed in the toxicity of oilfield chemicals, and has completed numerous assessments of the potential impacts of oil and gas development, both conventional and non-conventional, on the health of humans, livestock and other ecological receptors. His knowledge in this regard extends to the chemicals associated with all aspects of oil and gas development, from the drilling and completion of wells, to the construction and operation of pipelines and processing facilities. He is especially well-versed in the toxicology of hydrogen sulphide (H2S), sulphur dioxide (SO2) and reduced sulphur compounds, and the potential health hazards associated with sour oil and gas operations. Dr. Davies is regularly sought out by industry, the government, business groups, the legal community and professional associations for both his technical know-how and his ability to effectively communicate the principles and results of his work to audiences of all types. He has appeared as an expert witness before the courts and adjudicatory boards in several jurisdictions across North America, including the Court of Queen’s Bench Alberta, the British Columbia Environmental Appeals Board, the Alberta Energy Resources Conservation Board, the National Energy Board, and the Alberta Environmental Appeals Board.

Dr. Davies’ experience spans a diversity of different work environments, with roles ranging from technical specialist, to project manager, to senior administrator. Early in his career, he served as a toxicologist with the Health Protection Branch of Health and Welfare Canada, after which he advanced to the position of Research Associate (Toxicology) with Dow Chemical Canada Inc. Since joining Intrinsik, he has fulfilled a number of technical and managerial roles, including Senior Scientist, Vice-President (Western Operations), Vice-President (U.S. Operations), Senior Vice-President, and most recently Chairman of the Board. Dr. Davies’ educational qualifications include a B.Sc. Honours (Biochemistry), M.Sc. (Nutrition) and Ph.D. (Nutrition/Toxicology) from the University of Guelph. Guelph, Ontario. He has been a Diplomate of the American Board of Toxicology since 1980. He has served as an adjunct professor and lecturer within the Faculty of Dentistry and Medicine, University of Western Ontario, the Faculty of Medicine, University of Alberta, and the Department of Environmental Studies, Mount Royal College. He is a full member of the Society of Toxicology.

Experience Highlights

  • Recognized as an authority in toxicology and human health risk assessment. He has designed, conducted and managed a large number of risk assessment projects aimed at identifying, understanding and mitigating the health impacts associated with oil and gas activities, power generation facilities (coal- and natural gas-fired), forestry operations (OSB mills, sawmills, co-generation facilities), and mining operations.
  • Has conducted in-depth reviews of the toxicology of a number of different chemicals on behalf of industry, professional associations and regulatory agencies, including detailed assessments of the toxicity of hydrogen sulphide (H2S), sulphur dioxide (SO2) and nitrogen dioxide (NO2).
  • Considered the leading authority in Canada on matters related to the toxicology of oilfield chemicals and the assessment of the potential health impacts associated with oil and gas operations, with expertise extending to conventional (both sweet and sour oil and gas) and non-conventional (shale gas, tight oil and CBM) resources.
  • Currently leading a team on the development of a hazard-based screening tool for classifying hydraulic fracturing fluids in terms of their potential health and environmental impacts for use on an industry-wide basis across North America.
  • Has appeared before (and has been qualified) as an expert in toxicology and health risk assessment by a number of courts and adjudicatory boards across North America.
  • Broad-based work experience, both in terms of work environments and duties performed. He has served in technical, managerial and senior leadership roles over the course of his 35-year career, with experience gained in regulatory, industrial and consulting work settings.
  • Widely known for his expertise in toxicology and health risk assessment, having authored numerous reports and publications. Regularly invited to speak at meetings, conferences and workshops hosted by professional societies, business groups and communities on matters related to toxicology and health risk assessment.
  • Diplomate of the American Board of Toxicology (DABT) and full member of the Society of Toxicology.


Ph.D., Nutrition/Toxicology, University of Guelph
M.Sc., Nutrition, University of Guelph
B.Sc. (Honours), Biochemistry, University of Guelph

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