# John M. Jackson
**John M. Jackson** (born John Murice Jackson, 1950) is an American actor best known for playing Rear Admiral A. J. Chegwidden, the Judge Advocate General, on the CBS military drama series *JAG* from 1996 to 2004.[1](https://www.imdb.com/name/nm0413705/) He was born in [Baton Rouge, Louisiana](https://www.edgepedia.org/baton-rouge-louisiana), and raised in [Fort Worth, Texas](https://www.edgepedia.org/fort-worth-texas).[2](https://www.tvguide.com/celebrities/john-m-jackson/bio/3030310666/)
| Key fact | Detail |
|---|---|
| Full name | John Murice Jackson; the professional middle initial was forced on him because another "John Jackson" was already registered with the Screen Actors Guild, whose rules prohibit duplicate names[1](https://www.imdb.com/name/nm0413705/) |
| Born | 1950, Baton Rouge, Louisiana; raised in Texas[1](https://www.imdb.com/name/nm0413705/) • [2](https://www.tvguide.com/celebrities/john-m-jackson/bio/3030310666/) |
| Signature role | Rear Admiral Albert Jethro "A.J." Chegwidden on *JAG*, eight seasons (1996–2004), leaving one season before the show's cancellation in 2005[3](https://www.rottentomatoes.com/celebrity/john_m_jackson) |
| Breakthrough film role | Capt. West, a Navy JAG officer, opposite Tom Cruise in *A Few Good Men* (1992)[3](https://www.rottentomatoes.com/celebrity/john_m_jackson) |
| Other recurring roles | Daryl Elias on *Wiseguy* (1987–89); FBI Deputy Director Sam Cullen on *Bones* (2005–06)[4](https://www.encyclopedia.com/education/news-wires-white-papers-and-books/jackson-john-m-1950-john-jacks-john-jackson) |
| Later *JAG* revivals | Guest return as Chegwidden in the *NCIS* season 10 finale (2013) and six episodes of *NCIS: Los Angeles* (2017–18)[5](https://ncis.fandom.com/wiki/John_M._Jackson) |
| Before acting | Social studies teacher at Lyndon Baines Johnson High School, Austin, c. 1975–79, and baseball coach at El Camino Real High School, Woodland Hills, California[4](https://www.encyclopedia.com/education/news-wires-white-papers-and-books/jackson-john-m-1950-john-jacks-john-jackson) |
## Early life and path to acting
Jackson attended the [University of Texas at Austin](https://www.edgepedia.org/university-of-texas-at-austin), where a severe injury permanently ended his football career. He then developed an interest in community theater and eventually went to Hollywood to pursue acting more seriously.[3](https://www.rottentomatoes.com/celebrity/john_m_jackson) Before acting became his profession, he worked as a high school social studies teacher in Austin from about 1975 to 1979 and as a high school baseball coach in California; he has also worked as a horseback guide at [Rocky Mountain National Park](https://www.edgepedia.org/rocky-mountain-national-park) and in ditch digging, oil rigs, and construction.[4](https://www.encyclopedia.com/education/news-wires-white-papers-and-books/jackson-john-m-1950-john-jacks-john-jackson) [TV Guide](https://www.edgepedia.org/tv-guide) records that he went to New York in 1980 and later to Hollywood, and that he began acting in his late twenties.[2](https://www.tvguide.com/celebrities/john-m-jackson/bio/3030310666/)
His professional name carries a bureaucratic story: when he joined the [Screen Actors Guild](https://www.edgepedia.org/screen-actors-guild), another "John Jackson" was already registered, and SAG rules prohibit two members from using exactly the same name, so he registered with his middle initial.[1](https://www.imdb.com/name/nm0413705/) Early credits sometimes appear under the plain name John Jackson.[4](https://www.encyclopedia.com/education/news-wires-white-papers-and-books/jackson-john-m-1950-john-jacks-john-jackson)
## Television and film career
Jackson landed small television and film roles through the early 1980s, including *Local Hero* (1983), *The Hitcher* (1986), and *[Sid and Nancy](https://www.edgepedia.org/sid-and-nancy)* (1986), before becoming a regular on the 1987 crime series *Wiseguy* as Daryl Elias.[3](https://www.rottentomatoes.com/celebrity/john_m_jackson) • [4](https://www.encyclopedia.com/education/news-wires-white-papers-and-books/jackson-john-m-1950-john-jacks-john-jackson) His first noteworthy film performance came in 1992 as Capt. West, a JAG officer in *A Few Good Men*, a role that pointed directly toward his later television work.[3](https://www.rottentomatoes.com/celebrity/john_m_jackson)
**JAG.** In 1996 Jackson joined the military legal drama *JAG* as Rear Admiral A. J. Chegwidden, a former Navy SEAL who leads the [Judge Advocate General's Corps](https://www.edgepedia.org/judge-advocate-generals-corps). He played the role for eight seasons, departing one season before the series ended in 2005.[3](https://www.rottentomatoes.com/celebrity/john_m_jackson) The character was written as an ex-SEAL ambitious enough to aspire to [Chief of Naval Operations](https://www.edgepedia.org/chief-of-naval-operations), and the real [Judge Advocate General of the Navy](https://www.edgepedia.org/judge-advocate-general-of-the-navy), Rear Admiral Harold "Rick" Grant, welcomed the portrayal at a 1997 Navy Memorial event, presenting Jackson a plaque reading "from the real JAG to the reel JAG."[6](https://www.washingtonpost.com/archive/lifestyle/tv/1997/03/16/from-real-to-reel/ccefa73d-772a-4b8f-8158-fa552aff2aab/) In preparing to play an admiral, Jackson interviewed senior naval officers; the common answer he received was, "An admiral acts any damn way he wants to!"[7](https://doyouremember.com/152856/jag-cast-then-and-now)
**After JAG.** Jackson took a recurring role as FBI Deputy Director Sam Cullen on the Fox crime series *[Bones](https://www.edgepedia.org/bones-tv-series)* (2005–06) and continued as a frequent guest player in network dramas, including *[NCIS](https://www.edgepedia.org/ncis-tv-series)*, *Criminal Minds*, *[Castle](https://www.edgepedia.org/castle-tv-series)*, *CSI: Crime Scene Investigation*, *Grey's Anatomy*, and *Ghost Whisperer*.[4](https://www.encyclopedia.com/education/news-wires-white-papers-and-books/jackson-john-m-1950-john-jacks-john-jackson) • [1](https://www.imdb.com/name/nm0413705/) He returned to his signature character twice: in the *NCIS* season 10 finale "Damned If You Do" in May 2013, and in six episodes of *NCIS: Los Angeles* across 2017 and 2018.[5](https://ncis.fandom.com/wiki/John_M._Jackson) His later film work includes the role of Judge Edward Nichols in *Gifted* (2017).[1](https://www.imdb.com/name/nm0413705/) A 2024 retrospective noted that he had not acted since 2018.[8](https://www.yahoo.com/lifestyle/jag-cast-then-now-catch-104218369.html)
## Personal life
Jackson is married; his wife's name is Jana, and his son Conor became a professional baseball player, spending most of his major league career with the [Arizona Diamondbacks](https://www.edgepedia.org/arizona-diamondbacks).[4](https://www.encyclopedia.com/education/news-wires-white-papers-and-books/jackson-john-m-1950-john-jacks-john-jackson) • [7](https://doyouremember.com/152856/jag-cast-then-and-now) His listed avocational interests include coaching pony baseball, listening to jazz, and swing dancing.[4](https://www.encyclopedia.com/education/news-wires-white-papers-and-books/jackson-john-m-1950-john-jacks-john-jackson)
## References
1. [John M. Jackson, IMDb](https://www.imdb.com/name/nm0413705/)
2. [John M. Jackson Biography, TV Guide](https://www.tvguide.com/celebrities/john-m-jackson/bio/3030310666/)
3. [John M. Jackson, Rotten Tomatoes](https://www.rottentomatoes.com/celebrity/john_m_jackson)
4. [Jackson, John M. 1950- (John Jacks, John Jackson), Encyclopedia.com, Contemporary Theatre, Film and Television](https://www.encyclopedia.com/education/news-wires-white-papers-and-books/jackson-john-m-1950-john-jacks-john-jackson)
5. [John M. Jackson, NCIS Database (Fandom)](https://ncis.fandom.com/wiki/John_M._Jackson)
6. [From Real to Reel, The Washington Post (March 1997)](https://www.washingtonpost.com/archive/lifestyle/tv/1997/03/16/from-real-to-reel/ccefa73d-772a-4b8f-8158-fa552aff2aab/)
7. [The Cast Of 'JAG' Then And Now, Do You Remember](https://doyouremember.com/152856/jag-cast-then-and-now)
8. ['JAG' Cast Then and Now, Yahoo](https://www.yahoo.com/lifestyle/jag-cast-then-now-catch-104218369.html)
---
*Topic: Encyclopedia › Arts and culture › Screen and stage › Film and television › Screen people and creators › Screen actors of the Anglosphere and Europe › American actors: 1970s to 1990s › Surnames I to Kh*
*Initially written Sep 17, 2026 · Reviewed: Sep 17, 2026; Sep 20, 2026; Oct 25, 2026 · Edited: Sep 20, 2026; Oct 12, 2026; Oct 25, 2026 · Last review: Oct 25, 2026*
*Copyright 2026 EdgeChat AI, a subsidiary of Biostate AI.*
License: Edgepedia Community License 1.0, https://www.edgepedia.org/edgepedia/license