Driven by a love of design, Jose Gomez-Marquez, 33, studied mechanical engineering. And then, moved by an equally strong desire for social justice, he decided to devote that skill to leveling the playing field in health care. Today he directs the Innovations in International Health program at MIT, and his inventions (including an inhalable measles vaccine and a system that monitors tuberculosis treatment) are helping to improve medical access in the developing world.