Many nonprofits want to expand their staff and funding base so that they may serve a broader public. Until recently, little information was available about how such organizations may do so successfully. In an audio interview with Stanford Social Innovation Review managing editor Eric Nee, William Foster shares findings from the Bridgespan Group's groundbreaking research on what it takes to be in the big leagues. He discusses types of funders to pursue, how to restructure an expanding organization, and whether going big is right for everyone.