Marcus Lehto was a long-time Bungie employee and the Creative Director for Halo: Reach. He started at Bungie in 1997 and worked on all Bungie titles from Myth: The Fallen Lords through Halo: Reach. He is well-known for placing easter eggs into game models that he designed, including his initials on Master Chief's boot, his birthday engraved on the Scorpion tank, and the famous face that some players discovered behind the mask of the Spartan models in the beta of Halo 3's multiplayer.