In September 2016, Y Combinator announced that then CEO Altman would be leaving Y Combinator and moving to the role of president of YC Group, which includes Y Combinator. Former Twitter chief financial officer and chief operating officer Ali Rowghani was then in charge of the YC Continuity Fund when it started and continues to act as CEO of YC Continuity. Michael Seibel, who co-founded Justin.tv, is the new CEO of YC Core, the program that Paul Buchheit has run since 2016.