A Utah native, Stewart began his art education in 1912 at the University of Utah, before moving east to continue his studies at the Art Students League summer school at Woodstock, New York, and the Pennsylvania Academy of the Fine Arts in Chester Springs. Stewart became the head of the Art Department at the University of Utah in 1938, and held that post until his retirement in 1956.
Stewart worked with a wide variety of media, including oils, watercolors, pastel and charcoal, as well as etchings, linocuts, and lithographs. And, in addition to landscapes, Stewart also did portraiture and murals. He painted several murals for The Church of Jesus Christ of Latter-day Saints (LDS Church) buildings, including works found inside the LDS temples in Hawaii, Alberta, and Arizona, as well as murals for the Salt Lake City International Airport and the historic Bigelow-Ben Lomond Hotel.