John Tuzo Wilson

John Tuzo Wilson (October 24, 1908 – April 15, 1993) was a Canadian geophysicist and geologist who achieved worldwide acclaim for his contributions to the theory of plate tectonics.
"Plate tectonics" is the idea that the rigid outer layers of the Earth (crust and part of the upper mantle), the lithosphere, is broken up into around 13 pieces or "plates" that move independently over the weaker asthenosphere. Wilson maintained that the Hawaiian Islands were created as a tectonic plate (extending across much of the Pacific Ocean) shifted to the northwest over a fixed hotspot, spawning a long series of volcanoes. He also conceived of the transform fault, a major plate boundary where two plates move past each other horizontally ("e.g.," the San Andreas Fault). 
His name was given to two young Canadian submarine volcanoes called the Tuzo Wilson Seamounts. The Wilson cycle of seabed expansion and contraction (associated with the Supercontinent cycle) bears his name.
Early life and education.
Wilson was born in Ottawa on October 24, 1908, the son of John Armistead Wilson CBE, and his wife, Henrietta Tuzo. Wilson's father was of Scottish descent and his mother was a third-generation Canadian of French descent.
He became one of the first people in Canada to receive a degree in geophysics, graduating from Trinity College at the University of Toronto in 1930. He obtained a second (BA) degree from St. John's College, Cambridge in 1932 and then a doctorate (ScD). He then pursued further graduate studies as Princeton University, where he received a Ph.D. in geology in 1936 after completing a doctoral dissertation titled "The Geology of the Mill creek - Stillwater Area, Montana."
Career.
In 1936, Wilson joined the Canadian Geological Survey as a government geologist. This was interrupted by the Second World War during which he served with the Royal Canadian Engineers, serving in Europe and reaching the rank of Colonel. He was involved in Operation Musk Ox.
In 1946 he was appointed the first Professor of Geophysics at the University of Toronto. 
Wilson was president (1957–1960) of the International Union of Geodesy and Geophysics (IUGG). 
In 1967 he became Principal of the university. In 1974 he left to become the Director General of the Ontario Science Centre. In 1983 he became Chancellor of York University, Toronto.
He was the principal of Erindale College at the University of Toronto and was the host of the television series "The Planet of Man".
Honours and awards.
In 1969, he was made an Officer of the Order of Canada and was promoted to the rank of Companion of that order in 1974. Wilson was awarded the John J. Carty Award from the National Academy of Sciences in 1975. In 1978, he was awarded the Wollaston Medal of the Geological Society of London and a Gold Medal by the Royal Canadian Geographical Society. He also served as honorary vice president of the RCGS. He was a Fellow of the Royal Society, the Royal Society of Canada, and of the Royal Society of Edinburgh. 
He was elected president-elect (1978–1980) and president (1980–1982) of the American Geophysical Union.
He also served as the director general of the Ontario Science Centre from 1974 to 1985. 
Wilson and his plate tectonic theory are commemorated on the grounds of the Centre by a giant "immovable" spike indicating the amount of continental drift since Wilson's birth.
The J. Tuzo Wilson Medal of the Canadian Geophysical Union recognizes achievements in geophysics. He is also commemorated by a named memorial professorship and an eponymous annual public lecture delivered at the University of Toronto.
He is one of the 2016 inductees into .
Personal life.
Photography.
Wilson was an avid traveller and took a large number of photographs during his travels to many destinations, including European countries, parts of the then USSR, China, the southern Pacific, Africa, and to both polar regions. Although many of his photos are geological—details of rocks and their structures or panoramas of large formations—the bulk of his photos are of the places, activities and people that he saw on his travels: landscapes, city views, monuments, sites, instruments, vehicles, flora and fauna, occupations and people.
Family.
In 1938 he married Isabel Jean Dickson.
He retired in 1986 and died in Toronto on April 15, 1993.