From 1987 to 1997, he was a member of the active staff in the Department of Medicine at the Scarborough Grace Hospital, where he served as Physician-in-Chief from 1996 to 1997. During this time he was also a member of the division of Endocrinology and Metabolism at Mt Sinai Hospital in Toronto where he engaged in clinical teaching and clinical trials. In 1997, Dr. Grossman joined Eli Lilly Canada as Associate Vice-President, Clinical Research, supporting the areas of endocrinology and cardiovascular research. From 2003 to 2012 he was Vice President of Research and Development at Eli Lilly Canada.
Dr. Grossman is a member of numerous medical associations. In addition, he has served on the National Nutrition Committee of the Canadian Diabetes Association, is Past-President of the Toronto Diabetes Association, and was a member of the Institute Advisory Board of the Institute of Nutrition, Metabolism and Diabetes of the Canadian Institutes of Health Research (CIHR) for 6 years. He is well-versed in the ethical conduct of clinical trials, has presented numerous research papers and invited lectures, and has published clinical research and reviews in reputable medical journals.