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Steven Glenwood MacLean FRCGS (born December 14, 1954) is a Canadian astronaut. He was the President of the Canadian Space Agency, from September 1, 2008, to February 1, 2013. He was born in Ottawa, Ontario, and is married to Nadine Wielgopolski of Hull, Quebec. They have three children. He enjoys hiking, canoeing, flying, parachuting and gymnastics. In 2013 he returned to physics research as an associate member of the Institute for Quantum Computing (IQC) at the University of Waterloo.