Adult Swim

he did various guest roles on various AS shows, including ATHF (Standards and practices guy) and Sealab (advertising executive)

https://www.youtube.com/watch?v=3G5EwTz-oS0

https://www.youtube.com/watch?v=7LFMX4aeof4

Yup, the fandom wiki page lists most/all of them https://aqua-teen-hunger-force.fandom.com/wiki/George_Lowe

I definitely remember him voicing himself on the Antenna episode since he got to say his own name in that one.

And he was the recurring police officer on a bunch of episodes, the police officer banter in the "One Hundred" episode about the 100 beans was pretty great LOL.

Officer 1: Yup. This is the stuff. Hot sauce.

Meatwad: I did it. Oh, God, I did it.

Officer 1: Good thing this wasn't blood. I'd be licking AIDS right now.

Meatwad: I did it, y'all. Oh, God I did it.

Officer 2: Hey, these body parts are plastic.

Master Shake: Damn it! Listen, you semi-digital A-hole! I had those made in Hollywood! I'm a member of the Union, and I'm a trained professional! Now do your job sir!

Officer 1: Feels like a hundred degrees out!

Officer 1: Time for lunch. 1:00.

Officer 2: Hey can we have a hundred beans for lunch?

Officer 1: No, Tom, I've told you for the one hundredth time. No one sells beans individually. It's just not efficient.

Officer 2: Man, I feel like I haven't had beans in a century! What about Cascade of Beans on a hundred 100th street?

Officers: One hundred one hundred one hundred one hundred one hundred one hundred one hundred one hundred one hundred....

(quick copy from https://en.wikiquote.org/wiki/Aqua_Teen_Hunger_Force_(Season_7))