Major General Douglas Lute is the Director of Operations, the Joint Staff.
Lute graduated from the United States Military Academy at West Point in 1975. His first assignment was to the Second Armored Cavalry Regiment in Bindlach, Germany, where he commanded C Troop. He received a master’s degree from Harvard University and taught in the Social Sciences department at West Point.
He commanded 1st Squadron, 7th Cavalry at Fort Hood, Texas from 1992-94. He then served on the Joint Staff in the Directorate for Strategic Plans and Policy, J-5, and held a War College Fellowship at the Atlantic Council in Washington.
From 1998-2000 he commanded the Second Cavalry Regiment, part of XVIII Airborne Corps, at Fort Polk, Louisiana. He served next as the executive assistant to the Chairman of the Joint Chiefs of Staff for 14 months before joining the First Infantry Division in Schweinfurt, Germany, as the Assistant Division Commander. He commanded Multi-national Brigade East in Kosovo for 6 months in 2002 before being assigned to US European Command in January 2003 as the Deputy Director of Operations. He assumed his current post in September 2006.
Source - http://www.jcs.mil/bios/bio_lute.html