Muso believes no one should die waiting for health care. We build health systems to save lives by reaching patients faster, within hours of the moment they become sick. To do this, we partner with communities facing extreme poverty. Muso has spent more than a decade creating and improving our Proactive Care model, preparing it to serve the global effort for universal health care. We have documented rapid health improvements across the populations we serve: a 2018 study found that communities we reach in Mali, which previously saw some of the world’s highest child mortality rates, sustained child mortality rates lower than any country in sub-Saharan Africa for five years, and ultimately reached a rate on par with that of the United States. Patient access to care increased tenfold. Muso now serves the governments of Mali and Cote d’Ivoire in their efforts to translate the results of this research into national policy and practice.