From Wikipedia, the free encyclopedia. Dee Bradley Baker (born August 31, 1962) is an American voice actor. Noted as his long-running-role as Squilliam Fancyson and other various characters in the hit TV series SpongeBob SquarePants. He is best known for his voice-work on Avatar: The Last Airbender, Codename: Kids Next Door, Phineas and Ferb, Adventure Time with Finn and Jake, American Dad!, Ben 10, Star Wars: The Clone Wars, Halo, Gears of War, Portal 2, and Left 4 Dead. Description above from the Wikipedia article Dee Bradley Baker, licensed under CC-BY-SA, full list of contributors on Wikipedia.