OpenAI CEO Sam Altman has been reinstated to the board after an independent investigation found no reason for his removal. The investigation, which involved interviews with board members and employees and a review of over 30,000 documents, concluded that Altman and co-founder Greg Brockman are fit to lead OpenAI. The details of the investigation regarding Altman's sudden firing last fall are not fully disclosed, but the summary suggests it was due to a breakdown in trust and relationship with the previous board.