The Honorable Eric Rosenbach is a Senior Lecturer at the Harvard Kennedy School and is the Director of the Defense, Emerging Technology, and Strategy Program at the Belfer Center for Science and International Affairs. He previously co-led the Belfer Center with former Secretary of Defense Ash Carter. Rosenbach currently serves on the Secretary of State’s International Security Advisory Board and on the Secretary of Defense’s Defense Business Board. Rosenbach teaches graduate courses in policy development, strategy execution, and international security. He also teaches two online courses for HarvardX on managing cyber risk and public sector strategy execution. Rosenbach previously held several senior level appointee jobs in government. As the Chief of Staff to the Secretary of Defense from 2015-2017, Rosenbach was one of the senior-most leaders in the Department of Defense. He served as Secretary Ash Carter’s closest strategic advisor on key policy initiatives, such as the war to defeat ISIS, the “rebalance” to Asia, and the effort to check Russian aggression. Rosenbach also led the Department’s efforts to improve innovation by forging and managing key initiatives such as the Defense Digital Service and the Defense Innovation Unit.