Stanford Social Innovation Review, Fall 2017. Perpetuity is so yesterday. Or so it sometimes seems, as many high-profile philanthropists make clear their intention to do their “giving while living,” rather than establish endowed, perpetual institutions. The once-multibillion-dollar Atlantic Philanthropies is in the final stages of winding down operations. The Bill & Melinda Gates Foundation plans to spend down within 20 years of its founders’ deaths. And donors such as Sean Parker (of Napster and Facebook fame) have announced that their foundations will be limited-time.