OpenAI founder recalls drinking whiskey with Amber Heard at Musk's 'haunted mansion' — then a fight over control Greg Brockman arriving in court on Monday Bloomberg/Bloomberg via Getty Images OpenAI cofounder Greg Brockman returned for a second day of testimony at the Musk v Altman trial. He recalled a "celebratory" gathering where Musk's then-girlfriend, Amber Heard, served whiskey. Musk was excited by OpenAI's for-profit prospects — then resigned in a fight over control, he said. In the summer of 2017, Elon Musk hosted a festive gathering for OpenAI's cofounders at his Bay Area "haunted mansion." Amber Heard, his then-girlfriend, poured the whiskey as they celebrated the company's future. Days later, as the cofounders gathered again, Musk erupted in a bitter play for control of the company. "He stood up, and he kind of stormed around the table," OpenAI cofounder Greg Brockman told jurors on Tuesday in the ongoing federal trial pitting Musk against OpenAI CEO Sam Altman .…