Order Reprints Print Article Chairman and CEO of the Blackstone Group Stephen A. Schwarzman (left) and PIMCO's co-founder William Gross (right) are among 13 billionaires who have signed the Giving Pledge since May 2019. Getty Images Since May 2019, another 13 billionaires around the world have signed the Giving Pledge, a global, multi-generational commitment by some of the world’s wealthiest to give a majority of their wealth to philanthropy or charitable causes, either during their lifetimes or in their wills. Among those new to the list are William Gross, co-founder of PIMCO, the world's largest fixed-income investment company, and Stephen A. Schwarzman, chairman, CEO, and co-founder of investment firm Blackstone, according to the Giving Pledge’s announcement...