John Macleod (physiologist)

John Macleod
John Macleod c.1928
Born(1876-09-06)6 September 1876
Clunie, Perthshire, Scotland
Died16 March 1935(1935-03-16) (aged 58)
Aberdeen, Scotland
EducationUniversity of Aberdeen
University of Leipzig
Known forCo-discovery of insulin
AwardsNobel Prize in Physiology or Medicine (1923)
Cameron Prize for Therapeutics of the University of Edinburgh (1923)
Scientific career
FieldsMedicine
InstitutionsCase Western Reserve University
University of Toronto
University of Aberdeen

John James Rickard Macleod, FRS, FRSE (6 September 1876 – 16 March 1935), was a Scottish biochemist and physiologist. He devoted his career to diverse topics in physiology and biochemistry, but was chiefly interested in carbohydrate metabolism. He is noted for his role in the discovery and isolation of insulin during his tenure as a lecturer at the University of Toronto, for which he and Frederick Banting received the 1923 Nobel prize in Physiology or Medicine. Awarding the prize to Macleod was controversial at the time, because according to Banting's version of events, Macleod's role in the discovery was negligible. It was not until decades after the events that an independent review acknowledged a far greater role than was attributed to him at first.