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After weighing options for about a month, Shotwell decided to join SpaceX, drawn by Musk's commitment, proven by his initial investment of $100 million from the sale of PayPal. Upon voicing her concerns to Musk, he welcomed her to the team with humor and reassurance. By 2008, she had quickly risen through the ranks to become the president of the company, taking charge at a pivotal time as Musk split his focus with Tesla and other ventures.