As a teenager, Sikora appeared in a McDonald's commercial with
Michael Jordan in 1990. He made his
Broadway debut in 2006 after he was cast as one of the leads on
The Caine Mutiny Court-Martial. He is also an ensemble member of Chicago's Shattered Globe Theatre Company. Sikora made his television debut in an episode of
The New Adam-12 after playing extras on a few TV shows. He was cast as Johnny in
Rudy. After small appearances in TV shows and films such as
Early Edition,
Turks,
The Watcher, and
Ghost World, he was cast in two episodes of
Third Watch. In 2003, Sikora was cast as Roger in the
direct-to-video biographical-drama film
Gacy. After a few appearances in low-budget movies, he was cast in the Golden Globe-nominated
Normal. It was there that he had what he considers his "breakthrough" moment: when the film's star,
Tom Wilkinson, told him, "All you have to do is think the line and the camera will read it". Sikora also appeared onstage. He was part of the Geffen Theatre's production of
Fat Pig and the Los Angeles Theatre's production of
Killer Joe. He made many TV appearances between 2005 and 2012, including major network shows such as NYPD Blue (as Detective Joe Slovak),
ER, ''
Grey's Anatomy, Criminal Minds, Without a Trace, CSI: Miami, Prison Break, White Collar, Lost, and Dollhouse. He appeared the 2007 horror film Night Skies''. He appeared in two episodes of
Law & Order: Special Victims Unit in 2010. That year, he also portrayed Hans Schroeder in the HBO series
Boardwalk Empire, and an orderly at the mental hospital in
Shutter Island. In 2011, he was in the
television pilot for
Body of Proof, and had a full role in
Adult Swim's comedy horror TV series
The Heart, She Holler, as Sheriff. In early 2012, he appeared in
Safe as the son of the head of the Russian mafia. He returned to theater in September 2012 with
The Freedom of the City. In 2012, Sikora appeared in the
Tom Cruise feature film
Jack Reacher as an Army
sniper wrongfully accused of gunning down random people in
Pittsburgh, who requests
Jack Reacher's assistance to prove his innocence. In October 2013, he was cast in the
Starz original drama series
Power. In 2020, Sikora portrayed Frank Cosgrove Jr. on the third season of the
Netflix crime drama
Ozark, released on March 27, 2020. In 2021, he and his Black Fox Productions company signed a first look deal with
Lionsgate TV. ==Filmography==