FBI Director Christopher Wray has tapped King & Spalding partner Zachary Harmon as his new chief of staff, the firm confirmed Tuesday.

Wray's current chief of staff, Jim Rybicki, is a holdover from former FBI Director James Comey, who was fired by President Donald Trump last May. Wray has reportedly faced pressure from U.S. Attorney General Jeff Sessions to make changes at the FBI, and Trump has repeatedly expressed disapproval of the agency.

Harmon joined King & Spalding in 2003, and is a partner in the firm's special matters and government investigations practice. He worked with Wray, who chaired the practice until he joined the FBI last year, for more than a decade. A spokesman for the firm said Harmon will begin his new role at the FBI on Jan. 31, but declined to say when his last official day will be at the firm.

Harmon wore several hats at the Justice Department prior to joining King & Spalding, including special assistant U.S. attorney in Washington, D.C., and as a prosecutor in the Tax Division. He also worked as a trial attorney on the Enron task force and served as counsel to then-Deputy Attorney General Larry Thompson. Following the conviction of former FBI agent Robert Hanssen for espionage, then-FBI Director William Webster chose Harmon to lead an investigation into the bureau's security programs.

Harmon specializes in Foreign Corrupt Practices Act cases, and has written extensively on FCPA enforcement issues. His clients include Fortune 100 companies, a Big Four accounting firm and various global clients, according to his firm bio page. One recent client is the medical technology firm Medtronic, whom he represented in a joint FCPA investigation by the DOJ and U.S. Securities and Exchange Commission. Both agencies declined to pursue enforcement actions in 2013.

Harmon is a graduate of Princeton University and received his J.D. from the University of Texas at Austin.

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