James Christian Urbaniak (born September 17, 1963) is an American actor. As a character actor, is best known for his roles as Simon Grim in three Hal Hartley films: Henry Fool (1997), Fay Grim (2006) and Ned Rifle (2014), Robert Crumb in American Splendor (2003), Grant Grunderschmidt on Review (2014–2017), and Arthur Tack on Difficult People (2015–2017). Urbaniak also voiced Dr. Thaddeus "Rusty" Venture on Cartoon Network/Adult Swim's animated series The Venture Bros. (2003–2023). (Via Wikipedia)