For Brett Nelson, MD, MPH, DTM&H, the most important part of his global health work is what he leaves behind.

One day in 2012, for instance, the pediatrician from Mass General for Children (MGfC) was treating an infant at a tiny clinic in rural Kenya. Suffering from a life-threatening lung infection, the little girl squirmed and cried as she tried to dislodge the simple breathing device he had placed under her nose to deliver air into her lungs. . . . Read more.