Steve London was born Walter Gragg in St Louis, Missouri. His best-known role was as Agent Jack Rossman on the original Les incorruptibles (1959), which starred Robert Stack as Eliot Ness. London reprised his role as an Eliot Ness-type sidekick, Detective Lane (with fellow "Untouchables" actors Stack and Bruce Gordon), in 1966 on L'extravagante Lucie: Lucy the Gun Moll (1966). After this his career waned, and after graduating law school, he practiced law under his birth name.