Mason was born in 2534 in Austrailia, Earth. He was abducted by ONI Section III in 2540, and placed in the Spartan II Class III project. Mason quickly found a love and talent of sniping, getting some of the top scores in the entire class. Mason idolized the older Spartan IIs, particulary Linda-058 and did his best to follow in their footsteps. Mason was very emotional and jokeful, a trait strange for a sniper, and he would often bond deeply with other members of the squad. When Anna and Otto died in 2548, Mason was shocked. It took him years to fully heal. Mason is a crack shot, and he often hangs back in combat.