For Gracias, the Tesla and SpaceX investor and Musk’s friend, the 2008 period told him everything he would ever need to know about Musk’s character. He saw a man who arrived in the United States with nothing, who had lost a child, who was being pilloried in the press by reporters and his ex-wife and who verged on having his life’s work destroyed. “He has the ability to work harder and endure more stress than anyone I’ve ever met,” Gracias said. “What he went through in 2008 would have broken anyone else. He didn’t just survive. He kept working and stayed focused.”