As we live through a shift in the concept of leadership and of power itself, join some of today’s most high-profile, innovative and sometimes surprising leaders to explore how leadership is changing in the digital age. David Gergen is a professor of public service and director of the Center for Public Leadership at the Harvard Kennedy School. He has served as a White House adviser to four US presidents. Lawrence Summers is President Emeritus of Harvard University. During the past two decades he has served in a series of senior policy positions, including Secretary of the Treasury of the United States.