In his childhood, Bergen would often spend hours watching and taping cartoons, imitating voices as well as creating characters of his own.

[3][4] In March 1980, Bergen appeared as a contestant on a Teen Week episode of Wheel of Fortune, winning prizes including a watch.

He is the current voice of Porky Pig, and has also voiced Tweety, Barnyard Dawg, Henery Hawk, Hubie and Bertie, Marvin the Martian, Sylvester Jr., and Speedy Gonzales,[5] alternating the roles with Jeff Bergman, Mel's son Noel Blanc, Joe Alaskey, Greg Burson and Billy West.

[6] Bergen had previously voiced Bugs Bunny and Daffy Duck for ABC Family Fun Fair, an annual stage show for disabled children in the 1980s.

He also played the part of No-Face in the 2001 Academy Award-winning movie Spirited Away, one of the firefighters in The Incredibles, and Kai and Masaru in the Streamline-dubbed version of the anime classic Akira.