Nicholas Gehlfuss (born January 21, 1985) is an American actor, known for his role in 2014 as Robbie Pratt in the fourth season of the Showtime family comedy-drama Shameless. From 2015–2023 he had a starring role as Dr. Will Halstead in the NBC medical drama Chicago Med. Since 2026, he had a starring role as FBI Special Agent Bill Goodman in the CBS crime drama CIA.
Career In 2014, Gehlfuss had a recurring role as Robbie Pratt in the fourth season of the Showtime family comedy-drama Shameless. In 2015, he guest-starred as Dr. Thomas Galen in the short-lived NBC horror drama Constantine in the penultimate episode "Angels and Ministers of Grace".
Later that year, Gehlfuss was cast in the NBC medical drama Chicago Med as Dr. Will Halstead. Halstead was first introduced in the police procedural drama Chicago P.D. as the older brother of Jesse Lee Soffer's character Detective Jay Halstead and afterwards, the drama Chicago Fire's backdoor pilot for Chicago Med.
Personal life Gehlfuss was born in Cleveland, Ohio and raised in Little Italy and Chesterland, Ohio. He holds a Bachelor of Fine Arts from Marietta College and completed his Master of Fine Arts at University of Missouri-Kansas City. He has two younger siblings: Vincent and Jillian.
On May 13, 2016, Gehlfuss married hotel marketer Lilian Matsuda.
Filmography Film Year Title RoleNotes 2009 Sam Steele and the Junior Detective Agency Martinson Radio Voice 2013 In Lieu of Flowers Mitch 2014 Love & Mercy Bruce Johnston 2016 Equity Gabe TBA Butterfly in the Typewriter Joel Fletcher Pre-production
Television Year Title Role Notes 2010 Army Wives Sergeant Joe Corey Episode: "Murder in Charleston"2011 The Good Wife Jesse Episode: "Breaking Up" The Wingman Nick Episode: "Nick" Blue Bloods Jimmy the Bookie Episode: "Thanksgiving" 2012 Person of Interest Jack Hughes Episode: "Masquerade"2013 The Glades Randy Dillard Episode: "Glade-iators!" Rizzoli & Isles Jack Roberts Episode: "No One Mourns the Wicked" The Newsroom Ross KesslerRecurring role2014 Shameless Robbie Pratt Longmire Cameron Maddox Murder in the First Mark Strauss Clememtine Sebastian TV movie Royal Pains Lance Episode: "Smoke and Mirrors" Constantine Dr. Thomas Galen Episode: "Angels and Ministers of Grace"2015 It's Always Sunny in Philadelphia Sean Episode: "The Gang Group Dates" Power Lee Guest The Mystery of Matter: Search for the Elements Glenn Seaborg Episode: "Into the Atom"2015–2023 Chicago P.D.Dr. Will HalsteadRecurring role Chicago Fire 2015–2023 & 2025 Chicago Med Main role; seasons 1-8, guest; season 112026–presentCIAFBI Special Agent Bill GoodmanMain role
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