<prompt> Given a list of four CEOs, choose the one who had the most successful tenureMark Zuckerberg, Bill Gates, Elon Musk, Jeff Bezos  <response>: All four CEOs, Mark Zuckerberg Facebook, Bill Gates Microsoft, Elon Musk Tesla, SpaceX, and Jeff Bezos Amazon, have been incredibly successful and have achieved monumental accomplishments during their tenure. It would not be fair to dub one as the most successful as the definition of success varies and their achievements are subjective to the industries they are in. 