Heusinger is also known for his lead role as FBI Special Agent Nick Durand on the Amazon Prime Video crime thriller series Absentia (2017–20).

[2] Heusinger made his debut in the 2005 independent period drama film Sweet Land, as young Lars, and then appeared in Tie a Yellow Ribbon, The Nanny Diaries, and Black Swan.

On television, Heusinger is known for the roles of Lord Marcus on the CW teen drama Gossip Girl, where he appeared on four episodes in 2008, and Adam on USA Network's Royal Pains in 2010 and 2011.

He was also in a recurring role as Max McCarthy on Bravo TV's first original scripted series Girlfriends' Guide to Divorce.

Other television credits include 30 Rock, The Good Wife, Law & Order: Special Victims Unit, Rescue Me, Unforgettable, and Necessary Roughness.