"Together with the faculty, Dr. Miller has led MCG's School of Medicine to a truly impressive set of achievements," MCG President Dr. Ricardo Azziz said in a statement.
During Miller's tenure, MCG's medical school "has expanded across the state and is now the largest class in MCG's history and the ninth-largest medical school enrollment in the nation," the statement said. "We are grateful for Dr. Miller's exemplary professionalism, leadership and service, and we wish him the best in his future endeavors."
The reason for Miller's departure wasn't mentioned in the statement, which quotes him as saying: "I am thankful for my time at MCG, and I am honored to have been able to work with such fine faculty, staff and students during my service as dean. These are exciting times for MCG, and I look forward to this institution's continuing progress."
Miller will begin a sabbatical leave and will remain a tenured Regents' Professor in the School of Medicine, the statement said, noting that he would continue caring for his patients.
Miller's salary was $565,455, according to MCG records obtained by The Augusta Chronicle in April.
Dr. Peter Buckley, the senior associate dean for leadership development and chairman of the Department of Psychiatry and Health Behavior in the School of Medicine, has been named interim dean.
Buckley arrived at MCG in 2000 from Case Western Reserve University, where he was vice chairman of the Department of Psychiatry and medical director for the state psychiatric services in Cleveland.
"I am humbled to be offered the chance to play this role for an institution that has been so important to me," Buckley said in MCG's statement. "This is a tremendous responsibility, and I know that I will need the support and expertise of all our faculty and staff."
Buckley also addressed Miller's departure.
"As a friend and grateful mentee, I wish Doug every success in the next stage of an impressive career," he said. "I am excited by the work now ahead of us under Dr. Azziz's new leadership and -- like so many others at MCG -- I am fully committed to our institution and our community."