From Halopedia, the Halo wiki
Neil Davidge is a music composer working in collaboration with 343 Industries. Hailing from Bristol, England, he is known for his work with Massive Attack and the 2010 film Clash of the Titans. In early 2011, he was chosen by Sotaro Tojima to be Halo 4's composer. His work as a composer was featured in the Halo 4 announcement trailer and he was credited as such in June 2011. Yet, he was not officially announced as the game's musical composer until April 2012. Davidge composed the Halo 4: Original Soundtrack, which was originally released on October 22, 2012. Davidge, claiming to be a "passionate Halo fan", stated that he was honored and thrilled to help compose the score for Halo 4.