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). The Wilson cycle of seabed expansion and contraction (associated with the Supercontinent cycle) bears his name, in recognition of his iconic observation that the present-day Atlantic Ocean appears along a former suture zone and his development in a classic 1968 paper of what was later named the "Wilson cycle" in 1975 by Kevin C. A. Burke, a colleague and friend of Wilson. His name was given to two young Canadian submarine volcanoes called the Tuzo Wilson Seamounts. Wilson was president (1957–1960) of the International Union of Geodesy and Geophysics (IUGG). In 1967 he became principal of Erindale College, now known as University of Toronto Mississauga. 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 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. He was elected to the American Academy of Arts and Sciences in 1971 and the American Philosophical Society in 1971. Wilson was awarded the John J. Carty Award from the National Academy of Sciences, of which he was already a member, 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 that records the amount of plate movement 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