Funniest comedians of all time
Comedy is tough, but these 19 jokers have carved a lasting niche in the world of humor. From the quintessential late-night host to the first Asian-American to have her own sitcom, here are America's top comics. 

Richard Pryor
Joan Rivers
George Carlin
Tina Fey
Eddie Murphy
Bill Cosby
Kathy Griffin
Ellen DeGeneres
Jerry Seinfeld
Lily Tomlin
Bob Newhart
Dane Cook
Chris Rock
Jim Carrey
Woody Allen
Bob Hope
Margaret Cho
Johnny Carson