This paper offers insights from the perspective of the Connect U.S. Fund's administering staff and our collective experience designing and running a Rapid Response grantmaking program. There are numerous models of rapid response programs operating in the philanthropic world, such as grassroots "kickstarter" campaigns, grants to individuals in emergency situations, individual staff- or trustee-administered rapid response funds, and funds that address unexpected "marginal" costs (i.e., unanticipated travel or marketing). The field of rapid response funding does not have a consistent or thoroughly researched body of knowledge behind it. A broader, deeper, and more rigorous review and analysis of the various structures and methods of the effectiveness of these rapid response programs -- and the Connect U.S. Fund's own rapid response model -- would greatly benefit both the philanthropic and non-governmental communities. We hope this paper will help spur interested funders to take up that task.