Giving Pledge Adds Stephen Schwarzman, William Gross, and 11 Other Billionaires

4 in 2018 with $390 million giving.5 million in giving that year.King, who have appeared on the Philanthropy 50 twice: in 2016 with $100 million in giving (No.5 million in giving.

Print Giving Pledge Adds Stephen Schwarzman, William Gross, and 11 Other Billionaires Jose Sarmento Matos, Bloomberg, Getty Images Stephen Schwarzman, chief executive of Blackstone Group, is among the latest billionaires to promise to give at least half of his wealth to good causes.The Giving Pledge announced Monday that Stephen Schwarzman, William Gross, and 11 other billionaires have committed to giving away at least half their wealth since May of last year, bringing the number who have signed the pledge to 216.