Former Discord Product Head Peter Sellis Joins X as Product Leader Former Discord product head and Snapchat's first product manager, Peter Sellis, announced he has joined Elon Musk's X to lead the product team. He stated that X has been around for 20 years, but the next chapter will be the most exciting, with the goal of making the product look and feel better, and accelerating the attraction of new users and businesses. X's previous product head, Nikita Bier, stepped down in August of this year to become an advisor.