Doctor David Lorne John Tyrrell (born February 10, 1943) is a Canadian physician.Born in Edmonton, Alberta,he grew up on the family farm near Duffield and studied at the University of Alberta. Tyrrell interned at the University of Alberta Hospital and then went on to earn a PhD in pharmacology in 1972. He returned to Alberta in 1975 to train in internal medicine.From 1982 to 1994, he was director of the Infectious Diseases division and later the Department of Medical Microbiology and Immunology at the University of Alberta. In 1994, he became dean of the faculty of medicine at the university. In 2010, he secured a large donation for the university which established the Li Ka Shing Institute of Virology.In 2015 he was awarded the Izaak Walton Killam Award for his contribution to the field of health sciences.