John James Rickard Macleod

John James Rickard Macleod ( born September 6, 1876 in Cluny in Dunkeld, Perthshire, Scotland, † March 16, 1935 in Aberdeen, Scotland ) was a Scottish- Canadian physiologist.

John Macleod studied medicine at Aberdeen University and graduated with honors. Subsequently, he studied biochemistry in Leipzig. He was appointed in 1903 as professor at Western Reserve University in the U.S., but moved to Toronto later.

Macleod provided important work on diabetes and carbohydrate metabolism. For the discovery of insulin in 1923, he received together with Frederick G. Banting received the Nobel Prize in Physiology or Medicine. The award to him, and at the participating in discovering medical student Charles Best, was not without controversy not. However, he shared his prize money with James Collip, the biochemist who was responsible for the production of insulin from pancreatic tissue extract.