Former U.S. Ambassador to South Africa, James Joseph believes we must support those over 50 launching new careers later in life so they may continue to make significant contributions to society. In this audio lecture recorded at the Encore Career Summit, sponsored by the Center for Social Innovation at Stanford, Joseph reflects on what it takes to be a great leader in the second half of life. Using Nelson Mandela as a prototype, he reflects on how skills such as the ability to work with one's enemies are critical elements of the mature leader.