Senior Management

Chief Executive Officer:

Marilyn Johnston MLT, ART, is the company President and CEO. She is a medical technologist who is widely consulted for her expertise in coagulation and thrombosis. In addition, Marilyn  is a Research Associate with the Henderson Research Centre, a member of the Thrombosis Interest Group (Canada) and a member of CLSI (Clincal and Laboratory Standards Institute).

Marilyn can be reached by telephone at:

905-527-2299 extension 43775, or by email.

Medical Director:

Dr. Mark Crowther obtained his M.D. from the University of Western Ontario in 1990 and undertook training in Internal Medicine at the University of Western Ontario followed by hematology training at McMaster University.

 Dr. Crowther is an associate professor of Medicine at   McMaster University  and Director of the Hematology Residency Training Program. As well, Dr. Crowther  is section Head of hematology at  St. Joseph’s Hospital, overseeing  clinical thromboembolism  and hematology .

Dr. Crowther has published extensively in the field of hemostasis and thrombosis.