Dean Ornish is a clinical professor at UCSF and founder of the Preventive Medicine Research Institute. He's a leading expert on fighting illness -- particularly heart disease with dietary and lifestyle changes.
Ernest Madu founded the Heart Institute of the Caribbean, a revolutionary clinic for cardiovascular diseases in Kingston, Jamaica -- revolutionary for offering first-class health care in a developing nation. His next stop: Nigeria.
Max Rashbrooke's work focuses on two of the most urgent tasks facing the world: how to renew our systems of democracy and reduce growing economic disparities to have the foundation for a flourishing and harmonious life.
Physician Seyi Oyesola co-developed the "Hospital in a Box" -- a pop-up, portable, solar-powered OR for off-grid medicine in Africa and elsewhere. But, he says, Africa needs more than new tools to heal itself.
Robert Fischell invented the rechargeable pacemaker, the implantable insulin pump, and devices that warn of epileptic seizures and heart attacks. Yet it's not just his inventive genius that makes him fascinating, but his determination to make the world a better place.