Knocked Up director Judd Apatow has topped a new list of the smartest people in Hollywood. The moviemaker beat fellow directors Steven Spielberg and James Cameron to claim the top spot on the new Entertainment Weekly magazine list.

The smartest actor on the countdown is Will Smith at five and Meryl Streep is the cleverest woman at six.

George Clooney, Tyler Perry, producer Brian Grazer, Jerry Bruckheimer, Will Ferrell and director Peter Jackson also made the top 20 on the "50 Smartest People in Hollywood" list.

Entertainment Weekly editors choose the names on the list by picking out "the brightest minds" in the film business, based on those who are revolutionizing the way movies are made.

(This news article provided by World Entertainment News Network)