Jeronimo is an American born, US Navy (Hospital Corpsman) veteran-turned-actor. He's best known for his semi-recurring role of NCIS Agent Thompson/Thompson on the hit CBS drama, NCIS: Los Angeles (2009). His most memorable TV moment (brief but significant) was his first TV moment, on the wildly popular FOX drama, 24 (2001), followed by the long running Criminal Minds (2005).His "acting life" started with live theater, with his very first stage production performance happening during his last few months of active duty in the military, a few miles off base, of Naval Air Station Lemoore, in the small town of Lemoore, CA., in a barn, of all places. Before coming to Los Angeles to pursue a TV/Film career, he performed (at a feverish pitch) in a few dozen stage productions, in and around San Francisco, and a handful in Los Angeles, primarily with the The Actors' Gang Theatre Company.