Sir John Cunningham McLennan, 1867-1935
An outstanding Canadian scientist, McLennan was born in Ingersoll and moved to this house in 1883. He attended the University of Toronto where he later became Head of the Physics Department. His research and publications brought international recognition to the University's physics laboratory, which bears his name. A leading advocate of close ties between science, industry and government, McLennan was instrumental in founding the Advisory Council on Industrial and Scientific Research, later the National Research Council. His work in England on the magnetic detection of submarines and the use of radium in the treatment of cancer, his explanation of the yellow-green light in the spectrum of the aurora borealis and his success in liquefying helium, contributed to his world-wide reputation. He was knighted in 1935.
Plaque via Alan L. Brown's site Ontario Plaques. Full page here.