[1][2] Simon is the writer of Man Down, a post-apocalyptic thriller directed by Dito Montiel which stars Shia LaBeouf, Kate Mara, Gary Oldman, Jai Courtney and Clifton Collins, Jr.[3][4][5][6] He started his professional career as an actor in theatre with roles in the early 2000s and then made his television and film debut.

[7] In 2015 Simon wrote Synapse, a film where he made his theatrical acting debut.

Synapse starred Sophina Brown, Henry Simmons, Joshua Alba and Simon himself.

Synapse is the first theatrical film produced by Los Angeles Center Studios and Hollywood Locations.

[8][9] In 2018 Simon partnered with filmmaker Joe Carnahan, co-writing a reimagining of the popular cult film, The Raid, originally directed by Gareth Evans.