Jeff Bezos: Hey MacKenzie, let's quit our great jobs at DE Shaw, move across the country to Seattle, and start an online bookstore! [In 1994!]

By saying yes, she was, in effect, Amazon's first investor, and worked there in the early days. The value of positive support from family cannot be underestimated (see also Jeff Bezos' parents' early investment in the company).

Rockefeller avoided the press entirely (to his detriment really) until well after he'd retired.