While studying at Ryerson Institute of Technology's radio and television arts program, he also served in the Royal Canadian Air Force (RCAF) where part of his training centred on meteorology. In 1956, while still a student, he worked at CFPL-TV in London, Ontario; he then moved to Toronto radio station CFRB, where he stayed from 1957-1958. After graduating in 1958, he worked at CHEX-TV in Peterborough. When CFTO launched in 1961, Devall auditioned with 2,000 other hopefuls; he was one of six people hired as a broadcaster, and he started at the station on January 7 of the same year.