[9] In 2011, Leonard-Morgan composed the soundtrack for the sci-fi thriller Limitless,[10][11] and he also wrote music for the television series based on the film.

In 2012, he scored the sci-fi film Dredd,[12] for which he was shortlisted at the 2013 World Soundtrack Public Choice Award.

[14] Leonard-Morgan first became involved with video game soundtracks by composing material for Battlefield Hardline, which was released in March 2015.

[15][16] In May 2016, a trailer for Warhammer 40,000: Dawn of War III was released, which included his composition;[17] the game came out in 2017, with a score by Leonard-Morgan.

In an interview with Headliner Magazine on creating the score and soundtrack for the game, he said, "Writing dark music is relatively easy.