Dr. Paul Farmer, an infectious diseases expert and a medical anthropologist, is known worldwide for helping to bring quality healthcare to some of the most impoverished areas of the globe. More than 25 years ago, Farmer helped found the charity Partners in Health to provide free medical care in central Haiti. Today, Partners in Health teams up with local groups to treat people with HIV/AIDS, tuberculosis, malaria and other conditions in Haiti and countries around the world. The South African Nobel Peace laureate, Archbishop Desmond Tutu, calls him "One of the great advocates for the poorest and sickest of our planet." Farmer's previous book, "Haiti After the Earthquake," describes the massive suffering and ongoing recovery effort after the devastating January 2010 earthquake that killed hundreds of thousands of people. His latest, "To Repair the World: Paul Farmer Speaks to the Next Generation," collects a series of commencement addresses that Farmer has delivered to graduating college students going back more than a decade. Throughout, Farmer urges them to confront global problems through an approach that has long guided his work: a tireless commitment to social justice and solidarity with the world's poor. Farmer joins us to discuss why he thinks a community-based health approach can help fix the U.S. healthcare system, how Rwanda's model has drastically improved the lives of its citizens, and how to tackle the massive health problems in post-earthquake Haiti.