Aaron Zebley, a former special agent of the Federal Bureau of Investigation and an assistant U.S. Attorney, has joined the law firm WilmerHale as a partner.

Zebley most recently served as senior counselor in the National Security Division at the Department of Justice. He also previously served as Chief of Staff to Robert Mueller, the former director of the FBI, after serving as a special agent of the FBI in the Counterterrorism Division for seven years.

In between his two tours at the FBI, Zebley served as an assistant U.S. Attorney in the National Security and Terrorism Unit in Alexandria, Virginia. During his tenure there, he investigated and prosecuted crimes related to national security, terrorism, and violent crime.