A foundation is a powerful platform through which families can express their values in society. Yet, most families only use a small portion of their foundation assets to pursue their philanthropic missions. Funding solutions to the world’s toughest challenges requires far more resources than are available through foundations’ grantmaking alone. As families grapple with the scale of these challenges, many are seeking ways to activate more of their philanthropic assets towards their missions. Impact investing is a powerful tool for maximizing a foundation’s assets for good. This primer is a guide for families looking to align and activate their foundation’s assets to achieve their social and environmental objectives while meeting their foundation’s financial needs.