Jeremy B. Bash (born August 13, 1971) is an American lawyer. He was the chief of staff at the Central Intelligence Agency (2009–2011) and the U.S. Department of Defense (2011–2013) under President Barack Obama. As a senior advisor to Leon Panetta in both roles, Bash worked on a number of key initiatives, including the creation of a new defense strategy, formation of two defense budgets, counterterrorism operations, a new cyber strategy, and a range of sensitive intelligence operations.