Gary Schwartz as Demo and Heavy, respectively:

Noble Amassment of Hat tip to Grayson on the TF2 steam forums, for compiling some very interesting trivia about the voice actors behind Team Fortress 2.  Check it out.  Here are a few videos of them in other roles or in real life: Nathan Vetterlein (The Scout) (warning, language) Dennis Bateman (Spy and Pyro) Who [...]