In the United States, eighty-seven thousand foundations collectively own approximately $800 billion in assets. Each year, these foundations - financial institutions established for the public good - have a federal obligation to give just 5% of those assets toward achieving their mission. The remaining 95% of assets are traditionally invested in Wall Street, to preserve and grow the foundation's endowment and, consequently, ensure their capacity for philanthropic giving in perpetuity. In other words: foundations generally invest 5% for mission-first outcomes and 95% for finance-first outcomes. It is my resolute belief that challenging and changing this status-quo is not only philanthropy’s greatest 21st-century opportunity but our most critical obligation.