'It was brutal,' Musk says of his time with Heard, adding that the breakup led to the 'most concentrated period of pain' he had ever endured. 'Elon Musk', which is out Tuesday, sheds new light on Heard, 37, whose stormy marriage to Johnny Depp led to a televised civil trial in Virginia and ended with a jury awarding him $15 million in damages for defamation. In the book Isaacson writes that Musk, 52, who has 11 children by three different women, was 'not bred for domestic tranquility.' The book says: 'Most of his relationships involve psychological turmoil.
