Gregg Berger

[Xerus]

That's what I used to think as well, but if you listen carefully, he doesn't sound THAT Much like Charlie Adler's characters like Ed Bighead or Red Guy.

Yes, Charlie Adler and Gregg Berger almost do sound alike sometimes. In one episode of Real Monsters, the Monsters dressed up like the Gromble and Ickis, (Charlie Adler) did the Gromble's voice really good.

 

[D'Snowth]

Charlie Adler impresses David Feiss, which is why he probably chose him to play all three Cow, Chicken, and Red Guy.

 

[Drtooth]

Here's a couple to add

Toxic Crusaders: Junkyard, additional voices
Frasier: various V.O.'s
The Drew Carey Show: Watermellon Eating Contest Judge (live action appearance)

 

[jellyman kelly]

spun out....
greg berger is my dads name! with only 1 g in greg!