OpenAI Co-Founder Sam Altman will step down from Oklo Inc. as chairman of the board, the nuclear technology company said April 22.

Oklo CEO and Co-Founder Jacob DeWitte will replace Altman as chairman and member of the board.

“We deeply appreciate Sam’s leadership and dedication to our mission,” said Caroline Cochran, Oklo co-founder and COO. “We are excited to continue working to bring scalable, clean energy to the AI sector and beyond, and to continue to explore strategic partnerships with leading AI companies, including potentially with OpenAI.”

Last month, Daniel Poneman and Michael Thompson were appointed to Oklo’s board following Chris Wright’s departure from the board upon his confirmation as U.S. Secretary of Energy.