CHICAGO (CBS) – Robert Grant, the head of the FBI’s Chicago office who collaborated on a number of high-profile public corruption cases, is retiring, he announced Monday.

Grant, special agent-in-charge, will step down Sept. 3. He’s taking a job with the Walt Disney Company’s global security team in Los Angeles.

“I have witnessed the FBI do some amazing things.  It has grown and stretched in ways I never thought possible.  What I have come to realize is there is almost nothing the FBI cannot do when it sets a proper course and supports its tremendous people,” Grant, who served 29 years with the agency, said in a written statement.

The news comes on the heels of the retirement of U.S. Attorney Patrick Fitzgerald. The offices of Grant and Fitzgerald worked on some of Illinois’ most high-profile corruption cases in recent years, including the prosecutions and convictions of former governors George Ryan and Rod Blagojevich. The FBI’s Chicago office also participated in the sweeping “Family Secrets” case against several mob, or “Outfit,” members.

Grant began heading the Chicago office in 2005. He’s the longest-serving agent in charge for the Chicago office.\

LISTEN: WBBM Newsradio’s Lisa Fielding reports