Roger Gregson was a soldier of the Terran Confederacy from Shiloh. He was an acquaintance of Jim Raynor.
Gregson died during the Guild Wars. His name was memorialized in a statue placed in Centerville honoring all Confederate soldiers from Shiloh who fell in the conflict.
Golden, Christie (April 12, 2011). StarCraft II: Devils' Due. Simon & Schuster (Gallery Books). ISBN 978-1416-55085-3.