Adrian Perez
From Halopedia, the Halo wiki
Template:RealworldTemplate:BstaffAdrian Perez is an American filmographer and programmer. Born in 1982 and raised in Berkley Heights, New Jersey, he claims to be of Cuban descent, but this cannot be confirmed. He is currently an employee of Bungie Studios. His favorite gametype is CTF on Longest.
He was hired in 2001, two months before the completion of Halo: Combat Evolved. He was credited as a "Multiplayer programmer." He then continued his work on Halo 2 as an engineer. He is assumed to have worked on Halo 3.
It is possible that Corporal Perez was named after him, as his drawing on Bungie.net resembles Corporal Perez, but this is not a photograph, so it is not known for sure.