By the way, while we thought that the plot of FO1 and 2 was not consistent with FOBOS, the plot of FO3 is entirely consistent with it (Vault-Tec having access to FEV, etc.)
It's Paul Eiding, he did the voices for several characters in Fallout 3, including all the old male bastards and yes, he did the voice acting for Pippin in Diablo 1.
I'm sure you all know who he is, he has surprising range in his voice acting work and it's sometimes a surprise to find out that he was voice acting for a character, especially those which go without utilizing his notable baritone.