Jimmy Knepper
James Minter Knepper (November 22, 1927 – June 14, 2003) was an American jazz trombonist. In addition to his own recordings as leader, Knepper performed and recorded with Charlie Barnet, Woody Herman, Claude Thornhill, Stan Kenton, Benny Goodman, Gil Evans, Thad Jones and Mel Lewis, Toshiko Akiyoshi and Lew Tabackin, and, most famously, Charles Mingus in the late-1950s and early-1960s.
Jimmy Knepper

Tom Marcello Webster, New York, USA · Jimmy Knepper - trombone · CC BY-SA 2.0
- Full name
- James Minter Knepper.
- Born
- 1927. · Los Angeles.
- Died
- 2003. · Triadelphia.
- Nationality
- United States.
- Occupation
- musician and composer.
- Fields
- jazz.
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James Minter Knepper (November 22, 1927 – June 14, 2003) was an American jazz trombonist. In addition to his own recordings as leader, Knepper performed and recorded with Charlie Barnet, Woody Herman, Claude Thornhill, Stan Kenton, Benny Goodman, Gil Evans, Thad Jones and Mel Lewis, Toshiko Akiyoshi and Lew Tabackin, and, most famously, Charles Mingus in the late-1950s and early-1960s.
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Jimmy Knepper (1927–2003) was an American composer, jazz musician and musician, among other activities. Born James Minter Knepper in Los Angeles, the composer died in Triadelphia. Jimmy Knepper was a member of Mingus Dynasty. Genres include jazz.
Composed from admitted, traceable facts · 26 September 2026
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gnd · 16150295-7 · museum · 4c43836c-a57c-4817-a6be-44f404507f2a · wikidata · Q666088 · wikipedia · Jimmy Knepper
In this article
Biography
Biography
Knepper was born in Los Angeles, California, United States, the second son of a nurse and a police officer. His parents divorced shortly after his birth, and his mother had to take her abusive husband to court in order to get child support. He and his older brother, Robert, were sent to several boarding and military schools, Page Military Academy and St. John's Military Academy, while their mother worked. He picked up his first instrument, an alto horn, at the age of six while he was a pupil there. His first teacher persuaded him to put aside the alto horn and pick up the trombone because, as he said, he had a "trombone mouth". He played his first professional gigs in Los Angeles and traveled to Spokane, Washington, at the age of 15. He graduated high school, and later, attended classes at Los Angeles Community College. Knepper married Maxine Helen Fields, a trumpet player with the all-female jazz band the International Sweethearts of Rhythm on May 8, 1954, at a civil ceremony in Tucson, Arizona, while he was on tour with the Maynard Ferguson Band. They had two children: a daughter, Robin Reid Knepper Mahonen, and a son, Timothy Jay Knepper, who predeceased him. Knepper chose the names "Robin" and "Jay" to honor his idol, Charlie Parker, whom the jazz world knew as "Bird". He had four grandchildren. In 1959, the U.S. State Department funded a trip for bandleader Herbie Mann to visit Africa, after they heard his version of African Suite. In a stroke of serendipity, Knepper replaced Willie Dennis as trombonist in the band for this tour. The 14-week tour took place from December 31, 1959, to April 5, 1960. The musicians were Herbie Mann, bandleader, flute, and saxophone; Johnny Rae, vibraphonist and arranger; Doc Cheatham, trumpet; Jimmy Knepper, trombone; Don Payne, bass; Carlos "Patato" Valdes, conguero; José Mangual, bongos. Destinations listed on official itinerary were Sierra Leone, Liberia, Nigeria, Mozambique, Rhodesia, Tanganyika, Kenya, Ethiopia, Sudan, Morocco, Tunisia. Knepper documented this tour meticulously in a series of letters he sent home to his wife, daughter, and son. These letters were recently found carefully preserved in a dusty box in the attic of the family home, and have now been transcribed by his daughter. They provide a glimpse into the inner circles of a notable piece of jazz history, and the life of a touring musician, who was also a devoted family man. He paints vivid portraits of the personal life of the musicians he worked with, and his descriptions of the Africa's landscapes and people provide a vivid portrait of an era in which there were few civil rights for Africans in their own lands. Knepper's daughter is hoping to publish these letters. In 1962, Knepper toured the Soviet Union with Benny Goodman's big band as part of a cultural exchange during the Cold War, in which the Bolshoi Ballet also came to the US. This groundbreaking yet disastrous tour was also documented in Knepper's letters. Knepper also played in the pit orchestra through the entire run of the Broadway show Funny Girl, with Barbra Streisand, and later, Mimi Hines. After seventeen previews, the Broadway production opened on March 26, 1964, at the Winter Garden Theatre, subsequently transferring to the Majestic Theatre and the Broadway Theatre to complete its total run of 1,348 performances. In 1967–1968, he played in the pit orchestra at the Mark Hellinger Theatre for An Evening with Marlene Dietrich, for which Dietrich received a Tony Award in 1968. Knepper also appeared on and off Broadway in On Your Toes, and The Me Nobody Knows. While he was playing Funny Girl, Knepper became a member of the Thad Jones/Mel Lewis Orchestra, a big band formed by trumpeter Thad Jones and drummer Mel Lewis around 1965, which began the 40-year tradition of Monday night jazz shows at the Village Vanguard in New York's Greenwich Village. The band performed for twelve years in its original incarnation, but since the death of Lewis in 1990 it has been known as the Vanguard Jazz Orchestra. They have maintained a Monday-night residency at the Village Vanguard for four decades. Knepper again toured the USSR, as well as Japan and Europe, this time with the Jones/Lewis band, and appeared with them at the Montreux Jazz Festival in 1974. In 1969, Knepper toured and recorded You Never Know Who Your Friends Are, with keyboardist Al Kooper, in the jazz period which followed his departure from Blood, Sweat & Tears. Knepper appeared on this concert tour which included shows at the Philadelphia Spectrum, and in Atlanta, where he briefly met Janis Joplin. In 1980, he received a Grammy Award nomination, for Best Jazz Instrumentalist Performance, Soloist, for his album, Cunningbird. Knepper received the Best Trombonist award from DownBeat's Readers' Poll four years running from 1981 to 1984; he also achieved first place in the DownBeat Critics' Poll in 1981, and then five years running from 1983 to 1987.
With Charles Mingus
With Charles Mingus
Although Knepper worked with some of the most notable jazz musicians of the 20th century, he was perhaps best known for his collaboration and stormy relationship with bassist and composer Charles Mingus. Mingus's temper was notoriously bad, and he twice hit Knepper. Once, while onstage at a memorial concert in Philadelphia, Mingus reportedly attempted to crush the hands of his pianist, Toshiko Akiyoshi, with the instrument's keyboard cover, then punched Knepper; however, the legitimacy of this story has been called into question by both Akiyoshi and Mingus's son Eric Mingus. Later, Mingus reportedly punched Knepper in the mouth while the two men were working together at Mingus's apartment on a score for "Epitaph", in preparation for what became his disastrous concert at New York Town Hall, on October 12, 1962. The blow broke one of Knepper's teeth, ruined his embouchure and resulted in the loss of the top octave of his range on the trombone for almost two years. This attack ended their working relationship, and Knepper was unable to perform at the concert. Charged with assault, Mingus appeared in court in January 1963 and was given a suspended sentence. According to his daughter, Robin, Mingus also later mailed heroin to Knepper's home and made an anonymous phone call to the police. A little girl at the time, she remembered the police questioning her father after the mailman delivered the package. Nevertheless, in the 1970s, the two eventually reconciled thoroughly enough to play together in concert and on at least one of Mingus's last albums. Following Mingus's death, and the death of the first Mingus Dynasty bandleader, drummer Dannie Richmond, Knepper led the Mingus Dynasty orchestra and toured the Middle East and Europe.
Death
Death
In 2003, aged 75, Knepper died of complications of Parkinson's disease, in Triadelphia, West Virginia.
As leader
As leader
Jazz Workshop Presents: "Jimmy Knepper" (Debut, 1957; Danish EP reissued on Mingus Rarities, Volume 1, OJC) A Swinging Introduction to Jimmy Knepper (Bethlehem, 1957) The Pepper-Knepper Quintet (MetroJazz Records, 1958) Cunningbird (Steeplechase, 1976) Jimmy Knepper in L.A. (Inner City, 1977) Just Friends (Hep, 1978) with Joe Temperley Tell Me... (Daybreak, 1979) Primrose Path (Hep, 1980) with Bobby Wellins 1st Place (BlackHawk, 1982 [1986]) I Dream Too Much (Soul Note, 1984) Dream Dancing (Criss Cross Jazz, 1986) T-Bop (Soul Note, 1991) with Eric Felten
As sideman
As sideman
With Charles Mingus Tijuana Moods (1957) RCA East Coasting (1957) Bethlehem A Modern Jazz Symposium of Music and Poetry (1957) Bethlehem The Clown (1957) Atlantic Mingus Ah Um (1959) Columbia Mingus Dynasty (1959) Columbia Blues & Roots (1959) Atlantic Mingus Revisited (1960) Mercury Reincarnation of a Lovebird (1960) Candid Oh Yeah (1961) Atlantic, Tonight at Noon (1957–61) Atlantic Cumbia & Jazz Fusion (1978) Atlantic With Mose Allison Swingin' Machine (Atlantic, 1963) With Joshua Breakstone Evening Star (Contemporary, 1988) With Benny Carter Central City Sketches (MusicMasters, 1987) With Richard Davis Muses for Richard Davis (MPS, 1969) With Gil Evans Out of the Cool (1960) Impulse! The Individualism of Gil Evans (1964) Verve Blues in Orbit (Enja, 1971) Where Flamingos Fly (1971) Artists House Collaboration with Helen Merrill (1987) EmArcy With Ricky Ford Shorter Ideas (Muse, 1984) With Dizzy Gillespie Perceptions (Verve, 1961) With Jazz Artists Guild Newport Rebels (Candid, 1961) With Langston Hughes Weary Blues (MGM, 1959) With Clark Terry Color Changes (Candid, 1960) With Kai Winding The Incredible Kai Winding Trombones (1960) Impulse! With Chuck Israels National Jazz Ensemble directed by Chuck Israels (Chiaroscuro, 1976) With Herbie Mann My Kinda Groove (Atlantic, 1964) Our Mann Flute (Atlantic, 1966) With Kenny Burrell Guitar Forms (Verve, 1965) With Gary Burton A Genuine Tong Funeral (RCA, 1967) With the Jazz Composer's Orchestra The Jazz Composer's Orchestra (1968) JCOA Escalator over the Hill with Carla Bley (1971) JCOA With the Thad Jones/Mel Lewis Orchestra The Big Band Sound of Thad Jones/Mel Lewis featuring Miss Ruth Brown (1968) Solid State Monday Night (1968) Solid State Central Park North (1969) Solid State Basle, 1969 (1996) TCB Music – recorded 1969 Consummation (1970) Solid State Suite for Pops (1972) A&M Live in Tokyo (1974) Denon Jazz Potpourri (1974) Philadelphia International Thad Jones / Mel Lewis and Manuel De Sica (1974) PAUSA With Dick Katz In High Profile (Bee Hive, 1984) With Lee Konitz Lee Konitz Nonet (Chiaroscuro, 1977) Yes, Yes, Nonet (SteepleChase, 1979) Live at Laren (Soul Note, 1979 [1984]) With Al Kooper You Never Know Who Your Friends Are (1969) Columbia With the Toshiko Akiyoshi – Lew Tabackin Big Band Road Time (1976) RCA/Victor With George Adams & Dannie Richmond Hand to Hand (1980) Soul Note Gentleman's Agreement (1983) Soul Note With Mingus Dynasty Chair In The Sky (Electra 1979) Live at Montreux (Atlantic 1980) Reincarnation (Soul Note 1982) Mingus' Sounds of Love (Soul Note 1987) Live at the Theatre Boulogne-Billancourt/Paris, Vol. 1 (Soul Note 1988) Live at the Theatre Boulogne-Billancourt/Paris, Vol. 2 (Soul Note 1988)
Life and career
Dated record
Life and career
The full dated record · 1 entries
2003
Jimmy Knepper died in 2003 at Triadelphia.
Places
Named by the record
Places
Only places the record itself states, plotted where the house gazetteer settles their coordinates. Nothing is inferred from a name or a nationality.
Los Angeles.
Birth place
Triadelphia.
Death place
Primary material
Documents and archives
reference work
- Wikidata, structured authority record Q666088: Jimmy Knepper
Reputable secondary · Wikidata
- “Jimmy Knepper”, English Wikipedia, consulted as further reading
Reputable secondary · Wikipedia
scholarly publication
- Knepper, Jimmy, Oxford Music Online, 2003
Scholarly · Crossref registry · 2003
Institutional database
- MusicBrainz artist record for Jimmy Knepper
Scholarly · MetaBrainz Foundation
Notes from the source article
Cited by Wikipedia
Notes from the source article
These works are cited by the source article, in its own numbering. They are recorded as its citations, not as sources VALÉORINE has verified.
- 1.Jimmy Knepper, 75 Trombonist With Mingus. Los Angeles Times. June 17, 2003.
- 2.Colin Larkin. The Guinness Who's Who of Jazz. Guinness Publishing. 243/4. 1992. 0-85112-580-8.
- 3.Goodbye. Jazznation.com.
- 4.Kroner, Erling. Jimmy Knepper – In Memoriam. Kroner Music. 2003.
References
Citations
References
Each reference names the institution holding it, so a reader may go to the document itself.
scholarly publication
Knepper, Jimmy, Oxford Music Online, 2003Crossref registry
Institutional witnessInstitutional database
MusicBrainz artist record for Jimmy KnepperMetaBrainz Foundation
Institutional witnessreference work
Secondary witnessreference work
Secondary witness
The Encyclopedia exists whether or not anything is for sale. Corrections are recorded rather than overwritten, and every version of this record is kept. Published 14 August 2026.
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