Keel made his film debut as Harold Keel at the British Lion studio in Elstree, in "The Small Voice" (1948), released in the United States as "The Hideout." He played an escaped convict holding a playwright and his wife hostage in their English country cottage. Additional Broadway credits include "Saratoga," "No Strings," and "Ambassador." He appeared at The Muny in St. Louis as Adam in "Seven Brides for Seven Brothers" (1978); Emile de Becque in "South Pacific" (1992); Henry Higgins in "My Fair Lady" (1996); and as General Waverly in "White Christmas" (2000).