U.S. Park Police Chief Robert MacLean will become the Director of the Office of Law Enforcement and Security at the Department of the Interior starting next month.

A spokesman at the Department of the Interior said the agency notified employees of the change Thursday morning.

“Chief MacLean has a stellar record of protecting visitors and resources and is proud of the partnerships he has forged that have focused on the mutual law enforcement mission that transcends organizational jurisdiction and structure,” reads the statement to employees.

He is expected to start his new role on Sept. 16. Park police have not said what prompted MacLean to switch jobs or who may replace him.

He has worked for the U.S. Park Police Department for 28 years in various positions, including roles within the Crime and Violence Task Force, Media Relations, and SWAT. He was also command for the Force’s Homeland Security Division.

As chief of U.S. Park Police, MacLean has overseen the department’s headquarters in D.C. and field offices in New York and San Francisco.

The department came under scrutiny in 2017 after Virginia accountant Bijan Ghaisar was shot to death by two U.S. Park Police officers at a traffic stop in Alexandria, Virginia. The officers were named in a wrongful death suit filed by Ghaisar’s family earlier this year. The FBI is reportedly still investigating the incident nearly two years after the shooting.

After MacLean’s resignation, he commented for the first time on the investigation into Ghaisar’s death. “To bring objectivity to any type of critical incident like that, what I decided to do is have the FBI investigate it to bring that impartiality and objectivity,” MacLean told FOX 5. “I met with the Ghaisar family shortly after the incident to explain the reason why and that’s what we need to do in law enforcement is to afford the public the transparency of our actions of allowing an objective outside partner investigate our critical incidents like that.”

Ghaisar’s death has prompted legislation from local members of Congress to require uniformed U.S. Park Police officers to wear body-worn cameras, which MacLean supports.

This story originally appeared on WAMU.