Popple found Musk’s style aggressive, but he liked that Musk would listen to a well-argued, analytical point and often change his mind if given a good enough reason. “Some people thought Elon was too tough or hot-tempered or tyrannical,” Popple said. “But these were hard times, and those of us close to the operational realities of the company knew it. I appreciated that he didn’t sugarcoat things.”

