From Halopedia, the Halo wiki
Jacob Benton, also known as Cocopjojo, is a former employee of 343 Industries who worked as a mission designer for the Halo 4 campaign. He began his career at 343 as a Content Creator for the Halo Waypoint team, mainly serving as an editor for the fiction videos and other content. Prior to being hired by 343 Industries, he was one of the writers for the Halo-themed blog Ascendant Justice along with Jeremy "Vociferous" Patenaude.
In April 2013, Benton left 343 Industries to work as a designer at Bungie.