Bill Gates is the richest man in the world, with a net worth valued at $76 billion. Though the Microsoft founder donated the greatest amount, $1.92 billion dollars last year, this was just 2.5 percent of his worth. The donation went to the Bill & Melinda Gates Foundation and will be spent alleviating poverty and providing healthcare to people in developing countries.

Mark Lennihan/AP
Bill Gates, philanthropist and co-founder of Microsoft, participates in a session titled "Investing in Prevention and Resilient Health Systems," Sunday, Sept. 27, 2015 at the Clinton Global Initiative in New York.