Sam Altman has returned as CEO of OpenAI, with Mira Murati as CTO and Greg Brockman as President. The company has a new initial board consisting of Bret Taylor, Larry Summers, and Adam D'Angelo. The leadership change comes after a period of uncertainty, with Altman previously being fired and then reinstated. The new board will focus on strengthening OpenAI's corporate governance and ensuring the company's mission to develop artificial general intelligence benefits all of humanity.