You may not know the name or the face, but you will definitely recognize the voice of Jim Cummings.  He is the voice of over 400 different characters including Winnie the Poo and Darkwing Daine Jir.

In this video, Jim reads as the voice of Winnie the Poo, playing Darth Vader.  It' is absolutely hilarious to hear Darth Vader say "Oh, bother"