Nicholas Alan Gehlfuss is an American actor, known for his starring role as Dr. Will Halstead in NBC's medical drama Chicago Med. He appeared as Robbie Pratt in the fourth season of Showtime's comedy-drama Shameless.
2026CIATV showas Bill Goodman · 17 episodes2016EquityMovieas Gabe2015Chicago MedTV showas Dr. Will Halstead · 165 episodes2015The Mystery of Matter: Search for the ElementsTV showas Glenn Seaborg · 1 episodes2015Love & MercyMovieas Bruce Johnston2014ConstantineTV showas Thomas Galen · 1 episodes2014Murder in the FirstTV showas Mark Strauss · 1 episodes2014Chicago P.D.TV showas Will Halstead · 10 episodes2012Chicago FireTV showas Will Halstead · 21 episodes2012The NewsroomTV showas Ross Kessler · 4 episodes2012LongmireTV showas Cameron Maddox · 3 episodes2011Person of InterestTV showas Jack Hughes · 1 episodes2011ShamelessTV showas Robbie Pratt · 6 episodes2011Sam Steele and the Junior Detective AgencyMovieas Martinson Radio2010Rizzoli & IslesTV showas Jack Roberts · 1 episodes2010The GladesTV showas Randy Dillard · 1 episodes2009The Good WifeTV showas Jesse · 1 episodes2007Army WivesTV showas Sergeant Joe Corey · 1 episodes2005It's Always Sunny in PhiladelphiaTV showas Sean · 1 episodes—Butterfly in the TypewriterMovieas Joel Fletcher