One of the world's largest real estate companies started out as a side hustle. Then, he acquired a real estate license to save money on commissions, and discovered he had some talent as a broker. Liniger left the military in 1971, moved to Denver and worked for other real estate brokerages before co-founding Re/Max with his soon-to-be wife, Gail. When Liniger launched Re/Max, he was "terribly naive," he says — telling his first employee he "was going to build the largest real estate company in the world." Surround yourself with positive influencesAssociate yourself with people who share your goals, including the desire to succeed, Liniger advises.

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Persons: Max, Dave Liniger, Liniger, frugally, Gail, Jim Rohn, Berkshire Hathaway, Warren Buffett, Bill Gates, Gates, Buffett, you've Organizations: CNBC, U.S . Air Force, Indiana University, Re, Berkshire, Microsoft, Columbia University, NASCAR, NASA Johnson Space Center, . Space Command Locations: Denver, U.S, Tucson , Arizona, Colorado