David Brenner
Appearing on The Tonight Show for the first time has launched the comedic careers of dozens of household names (Jerry Seinfeld, Rodney Dangerfield, Rosanne Barr). David Brenner has been on the show a record 158 times. This makes him not just a star in the world of stand-up, but an Old School icon. He has been a mentor and friend to Bobby throughout his career. And he still finds time to send a nice noodle kugel every Succoth.
For more information about David Brenner, go to Wikipedia or visit his IMDB bio page.