From an interview where he talks about his role in……disneyshighschoolmusical………..cough
John Patrick Lowrie (Sniper):

Thanks again, and a Towering Pillar of Hat tip to Grayson, MormonJesus, and Pruplethingz for the video finds. Check out Meet the Team Fortress 2 Voice Actors on steampowered for more trivia and other videos. I left out a few, so check ‘em [...]

Grant Goodeve (Engineer) (warning, sentimental 70s folk)

And in a car commercial, buster: