Doug Wallace has spent nearly fifty years researching mitochondrial DNA. He helped map human migration from Africa and start the field of bioenergetics. Now Wallace, the Director of the Center for Mitochondrial and Epigenomic Medicine at the Children’s Hospital of Philadelphia and the 2017 winner of the prestigious Dr. Paul Janssen Award, is using mitochondrial DNA to explain many of the most pervasive diseases known — perhaps even aging itself.