He is best known for his roles as Evan "Buck" Buckley in 9-1-1 on ABC, and as Ryder in AMC's martial arts-based drama Into the Badlands.

[10] Stark then had a number of film roles (Underworld Blood Wars) and other TV roles before starring as series regular, Ryder, in AMC's martial arts-based drama Into the Badlands in 2015.

[11] Since 2018, Stark has played firefighter Evan "Buck" Buckley, a main character on the Fox/ABC procedural drama, 9-1-1.

[13] He has been romantically linked to actress Hannah Gottesman, whom he had previously moved in with before they had even met.

[14] In a 2024 interview with Men's Health, Stark spoke candidly about his experience of moving to Los Angeles to pursue acting.