Sean Shields is a U.S. Army colonel and the commander of the 20th Engineer. As a career engineer officer who previously led the 5th Battalion, 4th Security of Forces Assistance Brigade, and the 54th Engineer Battalion, 173rd Infantry Brigade Combat Team, Sean deployed to Iraq, Afghanistan 4 times and several times Eastern Europe as an adviser. He also supported the recovery efforts after Hurricane Katrina in 2010 and in 2024, after Hurricane Helene. He is a native of Carlisle, PA, and is a graduate of the AY24 Resident Program at the U.S. Army War College.