The Philanthropy 50

America’s biggest donors gave $5.6 billion to nonprofits in 2016, with foundations and universities receiving the most money. Also, read about the growing criticism of megaphilanthropists and their gifts, plus profiles of two of the most interesting people on the latest Philanthropy 50 list — Robert Smith, the wealthiest African-American man in the country, whose giving is on the rise, and Roxanne Quimby, the self-made businesswoman whose controversial gift protected a huge tract of wilderness in Maine.