Mark Jamison Sheppard

Brigadier General Mark Jamison Sheppard was the supreme commander of the Global Defense Intiative. Under his leadership GDI forces around the world waged the war against the Brotherhood of Nod during the First Tiberium War. Sheppard was a United States brigadier general before he was tapped to run the newly formed GDI.

Shepard was at times absent from his command post for various reasons, including an UN inquiry into GDI's supposed attrocities. He was an able and charismatic commander, and managed to turn Kane's media attack around to [GDI]] benefit, securing new funding (allowing the ORCA Assault Craft project to be completed) and countering Nod's assault, eventually arriving at Kane's doorstep in Sarajevo. It appeared that battling Kane had a certain personal character to him. He retired after the First War.

He had a son, Logan Sheppard, who was also in GDI, but was instead a commando, and had to often deal with the fact of being the son of a general.