Best known for his tenure at Bungie from 1997 to 2012, Lehto was one of the co-creators of the massively popular franchise Halo whilst holding his Creative Art Director position at the company. After working on Halo: Combat Evolved and creating Master Chief himself, he went on to participate in every other title in the series from Bungie before 343 Industries took over. Lehto later went on to create his own studio V1 Interactive, which launched Disintegration, although the game never gained popularity.