聯合世界書院
Peterson retired in 1977, and he was made an honorary member of the IBO's Council of Foundation in 1983. In 1987, he published the book "Schools Across Frontiers: The Story of the International Baccalaureate and the United World Colleges", a historical account on the development of the IB programmes and the United World Colleges closely linked to them. Peterson died in 1988. The IBO Cardiff Headquarters building, Peterson House, is named after him.