 From 1951–57 he was professor of International Air Law at McGill University, becoming the first director of the Institute of International Air Law, after which he was named Professor Emeritus.He was the author of the book "The Right to Fly" and pioneered legal thought on air/space rights of man-made satellites in orbit, commencing with the launch of Sputnik in October 1957 when asked by President Eisenhower to render a legal opinion on "flyover rights" when Sputnik was orbiting over the United States.His honorary doctorate from his alma mater, Princeton University, declared him the "Father of Air Space Law".