Gregory Dimitri Gadson (born February 19, 1966) is an American actor, motivational speaker, retired colonel in the United States Army and former commander of the U.S. Army Fort Belvoir garrison. He is also a bilateral above-the-knee amputee. He served in the U.S. Army for more than 20 years as a field artillery officer and served on active duty for Operations Desert Shield and Desert Storm, Operation Joint Forge, Operation Enduring Freedom, and Operation Iraqi Freedom.

Education and military career
Gadson attended the United States Military Academy at West Point, New York, graduating in 1989. He also holds a master's degree in information systems from Webster University and a master's degree in policy management from Georgetown University. He is a graduate of the Command and General Staff College and the Advanced Field Artillery Officers Course and in 2010, he became an Army War College Fellow at the Institute of World Politics in Washington, D.C.