Clemson University Chief of Police Greg Mullen recently announced his upcoming retirement after six years of leading the Clemson University Police Department and serving as associate vice president for public safety.

While at Clemson, Mullen guided CUPD to earning a gold standard in public safety, an accreditation only held by 4% of United States law agencies, according to Clemson News.

Mullen helped grow the Emergency Management Council and developed the Emergency Operations Center, both of which have been critical in enhancing University crisis response by increasing emergency preparedness, planning and exercise for all officers.

Much of Mullen’s time was spent navigating Clemson’s efforts to combat COVID-19. Under his leadership, over one million COVID-19 tests were distributed while campuswide infection rates remained low, according to Clemson News.

Prior to coming to Clemson, Mullen served as police chief for the city of Charleston, South Carolina. During his tenure, a gunman entered a church and killed nine people in 2015.

His firsthand encounter with an active shooter has helped Mullen amplify the University’s security against active threats by installing lockdown buttons and building and classroom scanners, as well as increasing camera surveillance and more.

“Chief Mullen has always had a clear mission and vision to protect and serve,” said Clemson University President Jim Clements in an official statement. “He is an incredible leader in our community, and through his dedication and commitment, Clemson University continues to be recognized at a national level for our campus safety and security.”

A national search is currently underway to hire an associate vice president of public safety, who will then assist with hiring the chief of police, according to Clemson News.