John Lewis Gilbert III is an American show business personality who has worked mainly on television game shows. Originally a nightclub singer and entertainer, he has hosted and announced a number of game shows from various eras, dating as far back as the 1950s. He is known primarily for his work as the announcer and audience host for the syndicated version of the quiz show Jeopardy! since its revival in 1984.

Charles John O'Donnell was an American radio and television announcer, primarily known for his work on game shows. Among them, he was best known for Wheel of Fortune, where he worked from 1975 to 1980, and again from 1989 until his death. O'Donnell was also known for announcing American Bandstand.