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Robert Lyle "Rob" Knepper (born 8 July 1959; age 62) 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 sixth season 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.

Knepper was a regular on the HBO series Carnivàle, which also featured Clancy Brown, John Fleck, and Michael John Anderson.

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, John Billingsley, Leon Russom, and Raphael Sbarge. 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. 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.

More recently, Knepper appeared in the 2017 revival of Twin Peaks, along with Miguel Ferrer, Mädchen Amick, Richard Beymer, Ashley Judd, Carel Struycken, Ray Wise, John Billingsley, Derek Mears, and Catherine Coulson. Between 2015 and 2018, he co-starred in the series iZombie.

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