Investor Ken Langone's parents worked as a plumber and cafeteria worker.
Net worth: $2.1 billion (as of Sept. 2013)
Kenneth G. Langone is an American businessman and investor best known for co-founding The Home Depot. Langone's high school principal had advised his parents not to burn money by sending the unpromising student to college. His father, a plumber, and his mother, a cafeteria worker, disagreed. Instead they mortgaged their house to send their son to Bucknell University in Pennsylvania. As a college student, Langone worked as a caddy, butcher, and ditch digger to stay afloat. His parents' faith in him and his hard work paid off: He earned a bachelor's degree in economics in about 3.5 years.
Langone supports many charitable organizations, including the New York Philharmonic, Ronald McDonald House, and the Damon Runyon Cancer Research Foundation. He's also donated to Bucknell University and New York University and supports Ken's Kids. For aspiring entrepreneurs, Langone's message is simple: work, work, work.