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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.
Shameless2011
Chicago P.D.2014
Chicago Fire2012
Person of Interest2011
Constantine2014
It's Always Sunny in Philadelphia2005
Chicago Med2015
Love & Mercy2015