Theler started his acting career in 2009, starring in several minor roles in TV series such as The Middle, Cougar Town, and The Hills.

[9] In 2012, Theler landed his first major role when he was cast in the ABC Family comedy Baby Daddy, playing Danny Wheeler, the brother of the title character.

He also starred as Jordan in Christmas movie How Sarah Got Her Wings, which was released on digital hd and video on demand on November 1, 2015.

[17] In 2016, Theler starred as Jake Kenman in family movie Secret Summer, which was released on April 2, 2016 on PixL (On Demand and YouTube).

[21] The same year, Theler was cast as Craig Hollis / Mister Immortal in the planned Marvel Cinematic Universe series New Warriors.

[27] Theler guest starred in Hulu's web comedy series Dollface playing the role of Ryan, a man Jules has a fling with.