Sergeant Major Wardell Jefferson serves as the Headquarters Department of the Army, Deputy Chief of Staff G-1 Sergeant Major, Pentagon, Washington, DC.

Sergeant Major Wardell Jefferson was born in Sharon, Pennsylvania. He entered the United States Army in April 1989 and attended One Station Unit Training at Fort Leonard Wood, Missouri. After his completion of training, he was awarded the Military Occupational Specialty of 12B (Combat Engineer). In November 1993, SGM Jefferson reclassified to MOS 75D (Personnel Records Specialist).

SGM Jefferson's assignments include: Team Leader, Squad Leader and Platoon Sergeant, 39th Engineer Battalion, Fort Dix, New Jersey; NCOIC Enlisted/Officer Evaluations and NCOIC Officer Management, 1st Battalion, 11th Infantry Regiment, Fort Benning, Georgia; NCOIC Personnel Actions Branch, NCOIC Strength Management Division, 7th Army Training Command, Grafenwoehr, Germany; Drill Sergeant and Drill Sergeant Leader, 1st Battalion, 61st Infantry Regiment, and U.S. Army Drill Sergeant School, Fort Jackson, South Carolina; Senior Personnel Services Sergeant, 59th Signal Battalion, Fort Richardson, Alaska; Commandant, U.S. Army Alaska Noncommissioned Officer Academy, Fort Richardson, Alaska; Headquarters Support Group Command Sergeant Major, ISAF Joint Command, Kabul, Afghanistan; G1 SGM, HQs V Corps, Heidelberg, Germany; and CSM, Headquarters and Headquarters Battalion, 4th Infantry Division, Fort Carson, Colorado. Commandant, 7th Army Noncommissioned Officer Academy, Grafenwoehr, Germany. SGM Jefferson most recently served as CSM, U.S. Army Human Resources Command.

His military schools include: The Noncommissioned Officer Education System; Nominative Leader Course, United States Army Sergeants Major Academy (Class 59); First Sergeant Course, Master Fitness Course, Airborne School, Air Assault School, Drill Sergeant School, Battle Staff Course and the Command and Staff Orientation Course. He holds an MBA (Human Resource Management) from Touro International University, a BS (Business Management) from Wayland Baptist University, and an Associate's Degree (Applied Technology) from Central Texas College.

His awards include the Legion of Merit (1 Oak Leaf Cluster), Meritorious Service Medal (1 Silver Oak Leaf Cluster), Defense Meritorious Service Medal, Joint Commendation Medal, Army Commendation Medal (3 OLC), Army Achievement Medal (1 Silver OLC), Good Conduct Medal (9th Award), National Defense Service Medal, Global War on Terrorism Service Medal, NCO Professional Development Ribbon (4), Army Service Ribbon, Parachutist Badge, Air Assault Badge and the Drill Sergeant Identification Badge. SGM Jefferson was the 2004 Adjutant General Corps Regimental Association NCO of the Year and awarded the SGM Larry Strickland Medal for Distinguished Achievement. He is a member of the prestigious Sergeant Audie L. Murphy Club.