Emmett Shear has been named interim CEO of OpenAI, succeeding Sam Altman, who is set to join Microsoft. The move followed Altman's abrupt departure amid speculation over AI model safety concerns. Shear denied board ousting due to safety disputes and pledged to investigate Altman's firing. Altman, a founding co-chair, will lead a new research group at Microsoft. OpenAI, a key player in the AI boom, faces employee resignations and uncertainty. Microsoft, a major backer, had initially supported Altman's return. The situation highlights tensions between OpenAI's mission and investor expectations.