Bill Gates and Warren Buffett playing doubles ping-pong. REUTERS/Rick Wilking Everybody needs some good advice sometimes — even billionaire tech CEOs.

Here's who Mark Zuckerberg, Bill Gates, Travis Kalanick, Jeff Bezos, and 10 more tech business leaders consider to be the mentors who supported them on their rise to the top.

Disclosure: Jeff Bezos is an investor in Business Insider through his personal investment company Bezos Expeditions.