This week, Y Combinator has added four new partners to the team under new president Sam Altman. Altman made the announcement in a blog post. Y Combinator’s outreach director Kat Manalac was promoted to the partner position. Stripe CEO Patrick Collison, Science Exchange CEO Elizabeth Iorns, and AeroFS CEO Yuri Sagalov are joining as part time partners. The three of them are all Y Combinator alumni.