From Halopedia, the Halo wiki
Brian Trifon is a composer and one of a duo (alongside Brian Lee White) comprising Finishing Move Inc., a recording studio responsible for working alongside 343 Industries in the production of various Halo soundtracks and musical pieces.
Trifon's first involvement with Halo, under Finishing Move Inc. and alongside Brian Lee White, was on Halo: Combat Evolved Anniversary, as part of the re-imagining of the game's original score and programming. He later helped composed the menu music for Halo Channel and assisted in production of the re-imagined score for Halo 2: Anniversary in 2014. Finishing Move Inc. was later responsible for composing, supervising and producing the soundtrack for Halo Wars 2 and its Awakening the Nightmare expansion alongside Gordy Haab. Finishing Move Inc. is also credited with work on the music of Halo Online, to an unknown capacity.