[2] 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. On the night of May 7, 2007, while returning from a memorial service for two soldiers from his brigade, he lost both his legs and severely injured his right arm to a roadside bomb in Baghdad.

He became one of the first military personnel to use a next-generation powered prosthetic knee with technology to make it possible for amputees to walk with confidence and with a more natural gait.

Director Peter Berg, having seen news articles about Gadson, decided to cast him as an army officer trying to recover from the loss of his legs.

[9] In 2023, Gadson made a guest appearance on the television series NCIS: Los Angeles, specifically in the second episode of the fourteenth season titled "Of Value".

His work has most recently been featured prominently in Coming Home: Journey, Community, Dialog, a public art project based in New York City that seeks to encourage communication between civilians and those who have served in the US military.