[2] A native of Livermore, California, Allen began training in acrobatics at a young age, and attended the Kirov Academy of Ballet in Washington D.C., where upon watching Taras Domitro perform Romeo & Juliet at the Kennedy Center, felt discouraged from pursuing ballet further.
Upon graduation, he lived in Los Angeles picking up commercial work as well as a part lip syncing in a Master P music video.
[3] In July 2015, Allen was cast in a lead role on the Hulu drama series The Path co-starring Aaron Paul and Michelle Monaghan, appearing in all 36 episodes.
[8] On January 28, 2022, Allen was cast as He-Man in the Netflix live-action film reboot of Masters of the Universe,[9] before it was canceled.
[10] In October 2022, Allen was announced to star in A Haunting in Venice, the third instalment of Kenneth Branagh's Hercule Poirot adaptations.