Nick Gehlfuss is an American actor whose career started with a voice role in the 2009 film Sam Steele and the Junior Detective Agency. The following year, he had his first television gig when he appeared in an episode of Army Wives. After more guest roles on TV, he played recurring roles Ross Kessler in The Newsroom and Robbie Pratt in Shameless. He also appeared as Cameron Maddox in Longmire and Mark Strauss in Murder in the First. Since 2015, he’s been starring the role of Dr. Will Halstead in Chicago Med, a role he has also reprised in the spin-offs Chicago P.D. and Chicago Fire.