Dr. Jeffries began his naval career in 1976 through the Armed Forces Health Professional's Scholarship Program. He previously earned a BA from Coe College in Cedar Rapids, Iowa in 1969 and completed graduate studies at the University of Colorado in secondary education in 1972. He earned a State of Colorado teaching certificate and coached multiple sports while teaching high school science.
Dr. Jeffries completed an Internship and Family Medicine residency at Naval Hospital Pensacola in 1982 and immediately attained Board Certification from the American Board of Family Physicians. His first staff assignment was to Branch Naval Hospital Twenty-nine Palms, Calif. He received appointments as Head, Family Practice Department, Acting Director Clinical Services, and Chief, Medical Staff.
In August 1984 Dr. Jeffries was transferred to the Department of Family Medicine at Naval Hospital Camp Pendleton. He served as a Staff Family Physician, Residency Faculty, and Clinic Director. In 1986 he was promoted to Director, Residency Training. During this period, he attained Board Certification in Family Medicine from the American Osteopathic Board of General Practice and Fellow, American Academy of Family Physicians. In 1990 he passed Board Certification for Added Qualification in Geriatric Medicine. Dr. Jeffries is a member of the American Academy of Family Physicians, Association of Military Osteopathic Physicians, and Surgeons (Past President), Uniformed Services Academy of Family Physicians, American Osteopathic Association, and the Association of Military Surgeons of the United States.
In 1990 he served in Operation Desert Shield with augmentation to the 1st Marine Division, Artillery Regimental Surgeon, 11th Marines. In theater, he was appointed deputy then acting Division Surgeon and in 1991 he was permanently assigned as Division Surgeon. In December 1992, he was appointed Marine Forces Central Command and I Marine Expeditionary Force (Forward) Force Surgeon for Operation Restore Hope in Somalia representing U.S. military healthcare to the Coalition.
In the summer of 1993 Dr. Jeffries was re-assigned to Naval Hospital Camp Pendleton as Residency Program Director and Department Head, Family Medicine. In 1996 he was appointed Chairman, Executive Committee of the Medical Staff and completed his tour as Director, Medical Services. In 1998 he reported to Marine Forces Pacific, Camp Smith, Hawaii, as the Force Surgeon and served on the TRICARE Pacific Executive Council and as a military liaison to the Board of Directors, Hawaii State Chapter American Red Cross. In 2000 he assumed duties as Deputy Commander for Clinical Services, Tripler Army Medical Center until April 2003 when he took command of Naval Hospital Camp Pendleton.
Rear Adm. Jeffries' personal decorations included the Distinguished Service Medal, Legion of Merit with four Gold Stars, Bronze Star, Defense Meritorious Service Medal, Meritorious Service Medal with one Gold Star, Combat Action Award, Joint Meritorious Unit Award, Navy Unit Commendation, Meritorious Unit Commendation with one Bronze Star, Army Order of Military Medical Merit, and Artillery Order of Saint Barbara.