He is known for his roles as Mike Montgomery in the ABC Family/Freeform series Pretty Little Liars,[1] Theo Raeken in the fifth and sixth seasons of the MTV series Teen Wolf,[3] and for voicing Cloud Strife since Final Fantasy VII Remake, for which he received a Golden Joystick Award for Best Lead Performer.

[8] Other acting credits include appearances in True Blood, Grey's Anatomy, and Back to You and the films Kill the Irishman and The Starving Games, a parody of The Hunger Games films.

[9][10] As a voice actor, Christian has voiced Cloud Strife in Final Fantasy VII Remake, reprising the role in Chocobo GP, Crisis Core: Final Fantasy VII Reunion, and Final Fantasy VII Rebirth.

On June 26, 2020, Christian was among the Teen Wolf alums who participated in a virtual charity stream to celebrate the series' ninth anniversary and benefit First Responders First, a charity which aided frontline workers during the COVID-19 pandemic.

[11] Christian's mother is Penobscot and grew up on a reservation in Maine.