4. Robert F. Smith | Net Worth: $5 Billion
Robert F. Smith built his fortune through the private equity firm, Vista Equity Partners that he founded in 2000. His firm specializes in software companies. He donated $50 million personally and through a foundation to Cornell University in 2016.
He served as an executive at Goldman Sachs prior to his private equity firm. He worked with heavyweights including Texas Instruments, Apple, Yahoo, Microsoft, and eBay during his time at Goldman Sachs. He also worked on various ventures over the years and contributed to causes like cancer research, wildlife conservation, and education.