OpenAI CEO Sam Altman and Phoenix-based private equity investor Jahm Najafi are among the nine philanthropists who joined the Giving Pledge this year, the group announced Tuesday, bringing the total members of the global ultra-rich community who are willing to give away at least half of their fortunes to solving society’s problems to 240. WASHINGTON, DC – MAY 16: Samuel Altman, CEO of OpenAI, testifies before the Senate Judiciary Subcommittee on Privacy, Technology, and the Law May 16, 2023 in W...