Major General Dean Sienko was born in Milwaukee, Wisconsin in 1956. He graduated Phi Beta Kappa from the University of Wisconsin-Milwaukee with a B.A. in General Studies in 1978 and then received his M.D. degree from the University of Wisconsin Medical School in 1983. Following graduation from medical school, MG Sienko completed a transitional internship at Cook County Hospital in Chicago. He was appointed an Epidemic Intelligence (EIS) Officer with the United States Centers for Disease Control in Atlanta in 1984, and completed a preventive
medicine residency at the CDC in 1987. MG Sienko worked for the Michigan Department of Public Health as a medical epidemiologist from 1987-1988. In early1989, he became the Medical Director and Chief Medical Examiner for the Ingham County Health Department in Lansing, Michigan, and in 2007 Ingham County appointed him to the position of Health Officer/Director.
MG Sienko earned a M.S. degree in Clinical Research Design and Statistical Analysis from the University of Michigan in 1989. He is board certified in Public Health and General Preventive Medicine. MG Sienko received a direct commission as a Second Lieutenant in the Wisconsin Army National Guard, Medical Services Corp, in 1982. He was assigned to the 13th Evacuation Hospital, Madison, Wisconsin until 1984, when he was released for a commission as a Senior Assistant Surgeon with the United States Public Health Service. Following three years of commissioned service with the Public Health Service, MG Sienko joined the Michigan Army National Guard. He was assigned to the 207th Evacuation Hospital as a general medical officer but was attached to multiple aviation battalions and units. He graduated from the United
States Army School of Aviation Medicine in 1989.
In late November 1990, MG Sienko was called to active duty with the 207th Evacuation Hospital during Operation Desert Shield/Desert Storm. He was a general medical officer with the 207th during their deployment to Saudi Arabia. Following redeployment, MG Sienko resumed his duties as a flight surgeon with the Michigan National Guard. In 1997, MG Sienko transferred from the Michigan National Guard to the United States Army Reserve. His first assignment in the USAR was as a preventive medicine officer with the 334th Medical Group, Grand Rapids, Michigan. In late 1997, MG Sienko assumed command of the 4201st United States Army Hospital, also in Grand Rapids, Michigan. He commanded the 4201st until 1999, when it was deactivated and transitioned to the HUS, 323rd Combat Support Hospital. In 1999, MG Sienko assumed command of the 307th Medical Group, Whitehall, Ohio. From March-October 2001, MG Sienko deployed with a large contingent of reservists and served as the Commander of Task Force Medical Falcon and U.S. KFOR Surgeon at Camp Bonsteel, Kosovo. On 1 October 2002, MG Sienko assumed command of the 804th Medical Brigade, Ayer, Massachusetts.
In February 2003, the 804th Medical Brigade was deployed under the direction of MG Sienko to Kuwait in support of Operation Enduring and Operation Iraqi Freedom. In May 2003, MG Sienko was appointed CFLCC Surgeon in command of all medical assets in Kuwait and Southern Iraq until January 2004. From October 2006 to 31 March 2008, MG Sienko was assigned to the U.S. Army Standby Reserve. On 31 March 2008, MG Sienko assumed command of 3d MDSC, Fort Gillem, Georgia.
MG Sienko is a graduate of the AMEDD Officer Basic and Advanced Courses, the United States Army Command and General Staff College, and the United States Army War College. His decorations include the Legion of Merit, Bronze Star, Meritorious Service Medal (with one oak leaf cluster), Army Commendation Medal, Army Reserve Components Achievement Medal, National Defense Service Medal with 2 Bronze Stars, Southwest Asia Service Medal with 2 Bronze Stars, the Kosovo Campaign Medal, Global War on Terrorism Expeditionary Medal, Global War on Terrorism Service Medal, Armed Forces Reserve Medal with M and 3 devices, NATO Medal, Liberation of Kuwait (Saudi Arabia) Medal, Liberation of Kuwait Medal (Kuwait), and the Army Service Ribbon. He has also earned the Army’s Senior Flight Surgeon Badge.