Stringer moved to the United States in 1965. After working at CBS's flagship station WCBS-TV for six weeks, he was drafted into the United States Army, and served as a military policeman in Saigon for ten months in the Vietnam War. He did not serve in combat, but was awarded the Army Commendation Medal for meritorious achievement. Stringer returned to CBS, where he had a 30-year career. He started in a series of lowly jobs, including answering backstage phones for The Ed Sullivan Show. He then became a journalist, producer and senior executive. He became a naturalised American citizen in 1985. He served as president of CBS from 1988 to 1995, where he was responsible for all the broadcast activities of its entertainment, news, sports, radio and television stations.