Paul English is a perpetual founder. Since high school, he's started 3 philanthropies and 8 companies—ranging from e-commerce, to gaming, to GetHuman, a site that helps users access human customer support. His best-known venture is probably KAYAK, a travel website launched in 2004 over two gin-and-tonics with co-founder Steve Hafner. Using a simple interface, KAYAK specialized in search; and it made partners out of potential rivals like Orbitz and Expedia by charging them a fee to send users to their sites. Eventually KAYAK became one of the most-searched "K" words on Google, and in 2012, it sold to Priceline for $1.8 billion. A few years later, Paul started yet another company, Lola.com—and says he plans to launch many more.