"During his run on "It Could Be You", Leyden was touted by announcer Wendell Niles as "the man who will amaze you with what he knows about you", partly because Leyden was often helped onstage and in the audience by well-concealed TelePrompters and "a team of spies and operatives" who investigated potential contestants.Although he was extremely popular, both in front of the camera and behind the microphone, Leyden's chronic health problems limited his on-screen work in the latter half of the 1960s (Bill Cullen and Larry Blyden filled in for Leyden on "You're Putting Me On", with Blyden becoming the permanent host of the show when Leyden suffered a cerebral hemorrhage in September 1969.