 Most recently, he was a Professor Emeritus at the University of Toronto Institute for Aerospace Studies.As an expert in aeronautics and astronautics, he contributed to the design and production of two glider aircraft, including the de Havilland Sparrow, and a number of Avro Canada aircraft, including the Avro Arrow.During the Apollo 13 emergency, U.S. contractor Grumman Aerospace Corp., which built the lunar module for NASA, asked the University of Toronto for help specifically in how to jettison the lunar module just prior to re-entry.