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Leon Carroll, Jr. is a technical adviser for NCIS. After the United States Marine Corps, Carroll later joined the real-life NIS/NCIS agency and worked there for two decades as a Special Agent before retiring.
- 3 min
Jun 30, 2023 · Mark Harmon, known for his role as Leroy Jethro Gibbs on NCIS, and Leon Carroll Jr., a former NCIS special agent and the show’s technical advisor, have partnered up to co-author the non-fiction...
Jun 30, 2023 · NCIS vet Mark Harmon and tech advisor/former Special Agent Leon Carroll Jr. have teamed on a non-fiction book that chronicles a World War II operation led by the ONI (Office of Naval...
- Matt Webb Mitovich
Nov 10, 2023 · In his latest adventure, the NCIS star Mark Harmon, 72, teams up with former real-life NCIS Special Agent and technical advisor to the TV series, Leon Carroll, Jr.
Nov 16, 2023 · Leon Carroll, Jr., a native of Chicago, Illinois, began his career in the United States Marine Corps as a commissioned officer. He devoted six years to active duty and an additional three years in the Marine Corps Reserves, ultimately attaining the rank of Major.
Nov 15, 2023 · Actor Mark Harmon first met retired NCIS Special Agent Leon Carroll Jr. on the set of the hit true crime show NCIS. The pair have teamed up again to publish a non-fiction book about a...
Jun 29, 2023 · Scrutinizing long-buried historical documents, co-authors Harmon and Carroll Jr. have brought forth a true-life NCIS operation that depicts the incredible high-stakes game of naval intelligence...
