Sikora made his screen debut in a television series Adam-12, which was directed by Charles Bail. The co-stars of this series are Ethan Wayne, Peter Parros, Miguel Fernandes, and Linden Ashby. Later, he featured in an American biographical sports movie Rudy, which was directed by David Anspaugh. The total budget for this movie was $12 million and made a collection of $22.8 million at the box office.
Likewise, Sikora has also appeared in an American black comedy movie Ghost World, which was directed by Terry Zwigoff. The stars of this movie are Illeana Douglas, Steve Buscemi, Thora Birch, and Scarlett Johansson. The movie grossed $8.8 million at the box office against the budget of $7 million.
In 2010, Sikora featured in hit American neo-noir psychological thriller film Shutter Island, which was directed by Martin Scorsese. The cast members of this movie are Leonardo DiCaprio, Michelle Williams, Emily Mortimer, and Patricia Clarkson. The movie became a huge hit and made a collection of $294.8 million at the box office against the budget of $80 million.
Similarly, Sikora has appeared in numerous other movies and television series that includes My Best Friend's Wedding, The Watcher, Gacy, Normal, Night Skies, Charlie Wilson's War, Safe, and Jack Reacher. Likewise, he also featured in numerous television series including Early Edition, Grey's Anatomy, Prison Break, Unforgettable, Underground, and Chicago P.D.
Regarding his ethnicity and nationality, Sikora is a white-American. He is a married man. However, he has not opened the name of his wife. He seems secretive about his personal profile related to his love life, affair, and girlfriend. Currently, he is living a blissful life along with his wife and there are barely any signs of divorce in their relationship. He has not welcomed any children yet.
Sikora is one of the versatile actors who is successful financially as well. He has appeared in numerous movies and television series from which he must have collected a decent amount of salary. As per some online sources, his current net worth is estimated to be $400 thousand.