Reid Hoffman, another member of the PayPal mafia, may be the most well-connected person in Silicon Valley, so it’s fitting that the company he co-founded nearly a decade ago, LinkedIn, is the most important social network for business professionals. (Hoffman reportedly introduced Mark Zuckerberg to Peter Thiel, which led to Thiel’s initial $500,000 Facebook investment.) After LinkedIn’s successful 2011 IPO, Hoffman became a billionaire, with a net worth estimated by Forbes at $3.1 billion. He remains LinkedIn’s executive chairman.
(MORE: LinkedIn Founder Reid Hoffman: How to Build Your Career in the Networked Economy)
Now a partner at venture-capital firm Greylock, Hoffman, 45, is known as one of technology’s savviest investors, with early stakes in Facebook, Zynga, Groupon, and Airbnb. Last year, Hoffman published a book entitled The Start-Up of You, in which he offered career lessons informed by two decades in Silicon Valley. Hoffman is an active philanthropist, and serves on the board of micro-lending nonprofit Kiva.org.