Before getting the part of T-Bag in "Prison Break" (2005), he considered becoming a park ranger to support his family, due to the 'phasing out of the middle-class actor'.
Brother-in-law of Michael Herald and Amy Skarb Herald.
During the filming of Hitman (2007/I), his Danish co-star Ulrich Thomsen jokingly confided in him that his last name, "knepper", is in fact a dirty word in Danish.
Father: Donald Knepper.
Graduated from Maumee Highs School in Maumee, Ohio. Was the class of 1977.
He had the tenor solos in the "Messiah" his senior year at Maumee High School.
He lives with his family in Los Angeles.
He was awarded a 1982 Joseph Jefferson Award Citation for Actor in a Principal Role in a Play for "Class Enemy" at the Next Theatre Company in Chicago, Illinois.
Mother: Pat Deck (died in 2003).
Robert and Tori are parents of a boy named Benjamin Peter Knepper (Ben Knepper).
Robert studied drama in Northwestern University (1977-1981).
Son of a veterinarian in real-life, his character "T-bag" on "Prison Break" (2005) has a twisted encounter with a veterinarian in Season 2.
Son-in-law of Peter V. Herald.