(written from a Production point of view)
Robert Lyle "Rob" Knepper (born 8 July 1959; age 56) is the actor who portrayed Wyatt Miller in the Star Trek: The Next Generation first season episode "Haven". Twelve years later he portrayed Gaul in the Star Trek: Voyager episode "Dragon's Teeth".
Knepper, the son of a veterinarian, was born in Fremont, Ohio and raised in Maumee (near Toledo). When he was growing up, his mother worked in the props department for the community theater, and because of her involvement, he became interested in acting. Knepper spent many years working in community theater and high school productions. Later, he studied drama at Northwestern University. He is a resident of Southern California.
He appeared as the male protagonist of a segment of the miniseries Red Shoe Diaries, who is pulled over and then seduced by a female police officer played by Denise Crosby. He also appeared in villainous roles in the feature films Hitman (with Timothy Olyphant) and The Transporter 3.
His best-known role is that of the sadistic convict "T-Bag" on the popular drama Prison Break, which featured Wade Williams, Michelle Forbes, and John Billingsley. He was also featured in the George Clooney-directed film Good Night and Good Luck which featured Frank Langella, Ray Wise, Glenn Morshower, and J.D. Cullum.
He was a regular cast member on the NBC drama series Heroes (during the fourth season) as Samuel Sullivan, the leader of a carnival of people with superpowers. Fellow season four stars include Zachary Quinto, Cristine Rose, and Kate Vernon.
More recently he made several guest appearances in the second season of Syfy's science fiction series Stargate Universe alongside series star Justin Louis. He also reprised his role as "T-Bag" Bagwell on the 2011 A&E drama Breakout Kings.