John Tuzo Wilson

John Tuzo Wilson was born on October 24, 1908, in Ottawa, Ontario. In 1930, he became the first person in Canada to graduate with a degree in geophysics from the University of Toronto, later earning a second bachelor’s degree from St John's College, Cambridge, and his doctorate in geology from Princeton University in 1936. During the Second World War, he served with the Royal Canadian Engineers, rising to the rank of colonel.

Initially skeptical of Alfred Wegener’s continental drift hypothesis, Wilson’s empirical investigations in the early 1960s convinced him that the Earth’s crust was dynamic. In 1963, he proposed the concept of volcanic 'hotspots' (mantle plumes), demonstrating that the Hawaiian island chain was formed as an oceanic tectonic plate moved steadily over a fixed, deep-seated heat source in the mantle.

In 1965, Wilson published his masterwork in Nature: 'A New Class of Faults and their Bearing on Continental Drift'. He coined the term 'transform fault' to describe the horizontal fractures that offset mid-ocean ridges (such as the San Andreas Fault), providing the crucial kinematic mechanism that proved ocean basins expand and contract. He also formulated the 'Wilson Cycle', which describes the periodic opening and closing of ocean basins over hundreds of millions of years. Serving as Director General of the Ontario Science Centre and Chancellor of York University, Wilson was named a Companion of the Order of Canada (CC) and awarded the Vetlesen Prize (the Nobel Prize of Earth sciences) and the Wollaston Medal.