Major General John Weidner is the Chief of Staff, United Nations Command (UNC) and United States Forces Korea (USFK), U.S. Army Garrison Humphreys, South Korea. UNC enforces the Armistice Agreement, facilitates diplomacy, and integrates multinational forces; while USFK, a Sub-unified command of U.S. Indo-Pacific Command, deters aggression and, if necessary, defends the Republic of Korea to maintain stability in Northeast Asia in armistice and crisis.
A native of St. Paul, MN, Major General Weidner was commissioned a second lieutenant in 1991 upon graduation from the Army ROTC program at St. John’s University, Collegeville, Minnesota, where he earned a Bachelor of Science degree in physics. He completed a Ph.D. in medical physics from the University of Wisconsin-Madison in 2012, and holds Master of Science degrees in medical physics, nuclear engineering, engineering management, and strategic studies. His military education includes the Engineer Officer Basic and Advanced Courses, the Combined Arms Services Staff School, the Command and General Staff College, and the Army War College. He is also a registered Professional Engineer in the state of Wisconsin.
Major General Weidner most recently served as the Deputy Director, Plans and Policy, United States Strategic Command (USSTRATCOM) at Offutt Air Force Base, Nebraska.
Major General Weidner previously served as the Director of the US Army Nuclear and Countering WMD Agency, Director of the USSTRATCOM Commander’s Action Group; Director for Strategic Capabilities Policy in the Defense Policy and Strategy Directorate on the National Security Council staff; Executive Director for the Office of Major Modernization Programs, National Nuclear Security Administration, Department of Energy; assistant professor in the Department of Engineering Physics at the Air Force Institute of Technology; stockpile associate for the Defense Threat Reduction Agency (DTRA) at Los Alamos National Laboratory, New Mexico; consequence management advisory team leader for DTRA at Kirtland Air Force Base, New Mexico; assistant professor in the Department of Physics at the United States Military Academy at West Point; and Deputy District Engineer for the St. Paul District, U.S. Army Corps of Engineers. He commanded B Company, 52nd Engineer Battalion at Fort Carson, Colorado and served as an Engineer Platoon Leader at Fort Riley, Kansas and in the Republic of Korea.