The Giving Pledge is a commitment by the world’s wealthiest individuals to dedicate the majority of their wealth to philanthropy

The Giving Pledge is a campaign to encourage the wealthiest people in the world to make a commitment to give most of their wealth to philanthropic causes. The campaign specifically focuses on billionaires (or those who would be billionaires if not for their philanthropy) and was made public in 2010 by Warren Buffett and Bill Gates. The Huffington Post reported in April 2012 that “81 billionaires committed to giving at least half of their fortunes to charity”. As of February 2014, 122 billionaire or former billionaire individuals and couples have signed the pledge

Learn more here http://givingpledge.org