From Halopedia, the Halo wiki
Armando Troisi was the Narrative Director at 343 Industries from July 2011 to April 2013. As the Narrative Director for the development of Halo 4, he directed writers, artists, and designers responsible for the story of Halo 4. He previously worked for Bioware, where he served as a writer for Mass Effect and Mass Effect 2. In April 2013, he left 343 Industries and became the Transmedia Narrative Director at Black Tusk Studios. Troisi is currently the Creative Director at Fathom Interactive.