This month, 12 more billionaire families committed to donate at least half of their wealth to charity by taking the Giving Pledge. Here are introductions to some of the new signatories and their pet philanthropic projects.
Theodore J. "Ted" Forstmann died on Sunday from complications related to brain cancer. The private equity pioneer's firm, Forstmann Little & Co., was one of the first to engage in leveraged buyouts -- using borrowed money to buy companies.