Jay Leno, Bob Newhart, Joan Rivers, Groucho Marx & Jerry Lewis
David Steinberg
Bob Newhart
terry bradshaw
Tool Time was hosted as a Home Improvement type show. The series began in 1991 and ended in 1999. The show consist of 6 main characters and many guest appearances.
Bob Hope holds the record for the most appearances on The Tonight Show, with over 100 appearances. Hope was a beloved comedian known for his quick wit and charm, making him a favorite guest on the show.
Jack Paar hosted The Tonight Show from 1957 to 1962
Bob Newhart
No. He was never the host, guest host or even a guest on The Tonight Show.
I cannot locate any appearances by Ted DeGrazia on The Tonight Show.
Animal Trainer Julie Scardina, followed by pro football Hall of Famer and analyst Terry Bradshaw.Actually the above answer is not accurate, [going by imdb's credits] the person who made the most appearances on Leno's Tonight Show was Robert Covarrubias. He appeared as various characters in sketches, followed by Adam Smith & Shannon Ratigan, then animal expert Julie Scardina, followed by Nina Bergman, then Ross Matthews and then Terry Bradshaw.Although if the question is strictly referring to celebrity appearances & not people who appeared on camera who worked for TTS, then Julie has the most appearances.
David Letterman never hosted The Tonight Show.
Presuming you mean David Letterman, David never hosted The Tonight Show on NBC. He hosted The Late Show on CBS from 1993 to 2015 & Yes, when he retired, Paul Shaffer & the band left the show as well.