Harry Johnson is the owner and founder of Radonmatters. He has his US-EPA certification in Radon Measurement and Mitigation through the US MidWest Universities Radon Consortium, University of Minnesota, and a Ph.D in Medical BioPhysics from the State University of New York at Buffalo.

After retiring from a successful career in Health Physics - Medical Physics and Nuclear Energy Research he recognized a need for a business which would provide homeowners with resources to detect and prevent radon. Since there were very few resources available in Canada, and living in Manitoba where radon is an issue, he investigated products that would best suit the needs of local homeowners. He completed radon training courses and took the exams to obtain his US-EPA/National Environmental Health Association (NEHA) certification in Radon Measurement and Radon Mitigation.

He then proceeded to subsidize and conduct his own research to assess the frequency in which homes in Winnipeg had radon levels elevated above the Health Canada guideline and to determine how to help in reducing these levels. Harry is listed as a certified radon service provider on the listings maintained by the Canadian Radiation Protection Association and by NEHA. He has experience in performing tests in Winnipeg and across Canada and has conducted mitigation in homes to successfully reduce radon levels.

Harry is the principal investigator of a radon research project funded through the External Research Program of Canada Mortgage and Housing Corporation. He is a member of the Canadian Radiation Protection Association, the Canadian Organization of Medical Physicists and holds an adjunct faculty position in the Department of Radiology, University of Manitoba. By means of Radonmatters, Harry has a venue for the provision of information, radon measurements and radon mitigation services as an expression of his interest in providing science for the betterment of public health.


Pam Warkentin, B.Comm.(hons)
Certified Radon Measurement Provider

Following graduation with an honours degree in Commerce from the University of Manitoba and having three children Pam partnered with Harry Johnson in his desire to start Radonmatters in 2006. After catching Harry’s excitement about the need for proper radon training and a quality-based radon testing service in Canada, Pam successsfully completed training through the US-EPA radon program at the MidWest Universities Radon Consortium, University of Minnesota. She holds the certification in Radon Measurement through the National Environmental Health Association, (NEHA) and she is a member of the American Association of Radon Scientist and Technologists (AARST).

Pam has experience conducting radon tests in Winnipeg with homeowners and in commercial buildings and has conducted research to study the effectiveness and accuracy of various durations of radon tests. Pam is listed as a certified radon service provider on the listings maintained by the Canadian Radiation Protection Association and by NEHA.

She is also currently involved in initiating a national radon organization for radon measurement and mitigation professionals across Canada. Pam is the co-investigator of a radon research project funded through the External Research Program of Canada Mortgage and Housing Corporation. She is motivated by her desire to focus on public health while maintaining a viable business and by the desire to see a healthy radon industry grow in Canada as an aspect of cancer prevention.


Ellen Johnson

Ellen Johnson has experience and training in records management and experience in customer relations. She works as Harry's executive assistance providing organizational support.