Jeff Rosenthal has been performing improvisational comedy on and off since 1995. His large size and substantial hairiness mean that his physical presence is memorable even when his improv isn't. Jeff also performs music (check out his music recordings and CD), and sometimes provides improv musical accompaniment. Early on in Jeff's showbiz career, he was told, "Don't give up your day job!". He has taken that advice seriously, becoming a professor in the Statistics Department at the University of Toronto; see his work page.