Jeff Strain was one of the three founders of ArenaNet, along with Patrick Wyatt and Mike O'Brien. He led the art and production teams for Guild Wars. In 2008, he left his position at ArenaNet to become the President of Product Development at NCsoft West. He left NCsoft West on August 11, 2009.
Prior to founding ArenaNet, Jeff Strain worked at Blizzard Entertainment for four years, where he created the StarCraft Campaign Editor and started the World of Warcraft project as the team lead and lead programmer.