Parsons came to Bungie from Microsoft in 2002 as an executive producer and studio manager. After working on the hit sequels Halo 2 and Halo 3, Parsons had a brief stint as an executive producer for Microsoft before joining Bungie's spinoff from Microsoft (along with most of the rest of Bungie) to become an independent developer.
While at Bungie, Parsons also co-founded a company in 2007 called Meteor Solutions which provides a variety of social marketing services to large companies like Microsoft, AT&T, and MTV Networks. As of November 2012, Parsons left Meteor Solutions to focus on Bungie full-time.
Parsons is a frequent interviewee for video game news sites and other media regarding Destiny, and speaks of the company's vision for and design of the franchise.