Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. John Herbert Chapman (August 28, 1921 - September 28, 1979) from London, Ontario, son of Lt. Col. Lloyd Chapman and Kathleen Chapman, was a Canadian space researcher. Chapman started his career with his work on radio propagation and the ionosphere. He later received a Master of Science degree and a Ph.D. in physics at McGill University in Montreal, Quebec. After his studies at university Chapman got his first position in the government with the Defense Research Board (DRB). He was then promoted to the position of section leader of the ionospheric propagation unit at the Defense Research Telecommunications Establishment (DRTE) in 1951 at Shirley's Bay, a Canadian military and civilian telecommunication research campus.He was also a superintendent.