100 Alumni of Influence

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Dr. James Edgar Till, O.C., BA’52, MA’54

James Till obtained his Master s degree in Physics, working with Harold Johns at the Saskatoon Cancer Clinic. With a PhD in Biophysics from Yale, he relocated to Toronto. In 1961, he and Ernest McCulloch reported the first quantitative method of studying individual stem cells in adult mouse bone marrow. Over the next decade, they and their colleagues delineated for the first time the concept of stem cells and established the framework in which normal and abnormal stem cells are studied today.