Deverell moved to Canada in 1967, and began her television career in 1972 as the producer of a children's television program. In 1974, she joined CBC Television as a journalist, including a stint with the program Take 30. In 1983, she left to become a journalism professor at the University of Regina, and in 1988 she left there to become one of the founders of Vision TV.
Deverell has been named to the Maclean's Honour Roll of Outstanding Canadians, and to the Canadian Association of Broadcasters Hall of Fame. She has also been a board member of Obsidian Theatre Company, a Toronto company which specializes in Black Canadian drama.
She was named a member of the Order of Canada in 2005.