James Urbaniak, a voice actor best known for the role of Dr. Thaddeus S. "Rusty" Venture on The Venture Bros., has confirmed on Twitter that he's one of the actors lending their voices to characters in Old World Blues, the upcoming Fallout: New Vegas add-on.
Can you find my voice in the "Fallout: New Vegas - Old World Blues" trailer? Yes. Yes, you can. http://go.ign.com/nuJ1e4”— James Urbaniak, Twitter