John Charles Daly
Daly's first foray into television was as a panelist on the game show "Celebrity Time". This led to a job in 1950 as the host and moderator on a new panel show produced by Goodson–Todman, "What's My Line?" The show lasted 17 years with Daly hosting all but four episodes of the weekly series.
Greer Garson
On 4 October 1956, Garson appeared with Reginald Gardiner as the first two guest stars of the series in the premiere of NBC's "The Ford Show, Starring Tennessee Ernie Ford". She appeared as a mystery guest on "What's My Line" on 25 October 1953 and again on 6 April 1958 to promote her appearance onstage in "Auntie Mame". She also served as a panelist rather than a guest on the "What's My Line" episode which aired on 12 May 1957.