Stewart has been one of Canada's most prominent foreign correspondents. He covered many of the world's conflicts and has reported from ten war zones, from El Salvador and Beirut to Afghanistan. During the Gulf War, he was the first Canadian reporter to get into the liberated Kuwait City. In the Second Sudanese Civil War in 1989, his report on child slavery, "Sudan: Children of Darkness" (with Tony Burman), won several international awards, including the UNDA prize at the Monte Carlo Television Festival. He has worked extensively in underdeveloped countries and was the first North American reporter to focus the world's attention on the massive Ethiopian famine of 1984-85 (also with Tony Burman). In 1987, Stewart's career was the subject of a major documentary, "The War Reporters", produced by Brian McKenna.