Funder collaboration has been a hot topic in philanthropy for years. But interest has grown of late as more funders realize that individual efforts simply are not enough to address complex social problems. As the Foundation approached its 50th anniversary, it asked The Bridgespan Group to assist in taking stock of what Packard can learn from its many collaborations. This report captures the themes, insights, and recommendations that emerged from Bridgespan’s research. While geared toward Packard, this report is broadly relevant to philanthropy and contributes to a field-wide discussion of effective donor collaboration.