Marcus Gilmore was born October 10, 1986, in Hollis, Queens, New York, into one of jazz drumming's defining families. His grandfather is Roy Haynes, one of the most influential drummers in the music's history, who died in November 2024 at nearly 100 years old; his uncles, Roy's sons, are cornetist and M-Base Collective founding member Graham Haynes and drummer Craig Haynes. Marcus knew by age seven that drumming was his calling. On his tenth birthday, Roy gave him a Ludwig kit he himself had played in the late 1980s and early '90s — worn heads and all — a gift Gilmore has described as carrying "the best type of feeling." Rather than steering his grandson's development, Roy Haynes said his own approach was simply, "I listen to him."

Gilmore graduated from the Fiorello H. LaGuardia High School of Music & Art and Performing Arts and received full scholarships to both the Juilliard School's Music Advancement Program and the Manhattan School of Music. He was playing professionally well before he finished either: while still a junior in high school, in 2002, he performed alongside his grandfather at Birdland, and he has toured internationally since age sixteen.

Chick Corea first heard Gilmore at a Blue Note benefit concert and invited him on the road not long after — the start of a relationship that ran for the rest of Corea's life. Around the same period, pianist Vijay Iyer brought Gilmore in alongside bassist Stephan Crump to form the Vijay Iyer Trio, whose debut, Historicity (2009, ACT), announced a rhythm section built on genuine metric daring rather than straight-time support. By 25, Gilmore had been named a Rising Star Drummer in the DownBeat Critics Poll (2012), the same year the trio's Accelerando and the Vijay Iyer Trio itself topped the same poll's Jazz Album and Jazz Group of the Year categories — a rare instance of a working rhythm section, not just its leader, being singled out at that level.

The Corea relationship deepened across the 2010s: The Continents (2012, Deutsche Grammophon), a concerto for jazz quintet and chamber orchestra; The Vigil (2013, Concord/Stretch), the debut of Corea's reconstituted electric band; Tempus Fugit (2018, credited to Chick Corea Vigilette); and Antidote (2019, Concord Jazz), credited to Chick Corea & The Spanish Heart Band, which won the Grammy Award for Best Latin Jazz Album at the 62nd Annual Grammy Awards in January 2020. Gilmore is a credited performer on the winning release.

His session catalog beyond these two core relationships runs deep and wide: a long-running credit with Steve Coleman's Five Elements and Council of Balance dating back to 2006; five albums with guitarist Gilad Hekselman between 2008 and 2025; Chris Potter's The Dreamer Is the Dream (2017, ECM), a Grammy-nominated quartet date with David Virelles and Joe Martin; the 2018 collective session In Common with Walter Smith III, Matthew Stevens, Joel Ross, and Harish Raghavan; and a credited spot on the Soul soundtrack (2020), the Oscar-winning Pixar film. In 2018–2019 he was selected as a protégé in the Rolex Mentor and Protégé Arts Initiative, paired with tabla master Zakir Hussain — a relationship that shaped his rhythmic thinking well outside the jazz tradition and that he honored with his first solo Carnegie Hall concert in 2026, after Hussain's death in December 2024. The American Composers Orchestra commissioned his first orchestral work, which premiered with the Cape Town Philharmonic in 2020 and received its full New York premiere in 2023.

The pace of Gilmore's own projects has only accelerated recently. Refract (2023) and Shards (2026), both on Red Hook Records, pair him with pianist Jason Moran and the electronic producer BlankFor.ms in an ambient, genre-blurring trio; Trio of Bloom (2025, Pyroclastic Records) puts him alongside Craig Taborn and Nels Cline; and Murasaki (2025, Loveland Records), with guitarist Jakob Bro and trumpeter Wadada Leo Smith, credits Gilmore as co-writer on every track. He is also the drummer on Sullivan Fortner's Southern Nights (Artwork Records), recorded live during a 2023 Village Vanguard residency and released in February 2025, which won the Grammy Award for Best Jazz Instrumental Album at the 68th Annual Grammy Awards in February 2026 — Gilmore's second Grammy-winning credit.

After more than two decades as one of the most in-demand sidemen in jazz, Gilmore stepped forward as a leader in his own right with Journey to the New: Live at the Village Vanguard, recorded July 26–27, 2024, during one of the same residencies that produced Southern Nights, and released May 16, 2025. The sextet — Rashaan Carter and Burniss Travis on upright and electric bass, David Virelles on piano, Morgan Guerin on electronic wind instrument, and Emmanuel Michael on guitar, playing compositions by Gilmore, his bandmates, and the late Geri Allen — was named the number one jazz album of 2025 by The New York Times. Days before its release, Newport Jazz Festival artistic director Christian McBride invited Gilmore to lead his own set at the festival for the first time; he assembled pianist Danilo Pérez, bassist John Patitucci, and saxophonist Kenny Garrett — musicians he had watched perform alongside his grandfather throughout his life — for "A Centennial Tribute to Roy Haynes" on August 2, 2025, Gilmore's own account of finally stepping into bandleading on his own terms while still carrying his grandfather's name forward.

Gilmore's playing starts from a direct family inheritance — the touch, dynamics, and structural logic he absorbed from Roy Haynes — but it runs through several other vocabularies that make it distinctly his own. The polyrhythmic, metrically adventurous language he developed inside the Vijay Iyer Trio, steeped in Steve Coleman's M-Base thinking (a scene his uncle Graham Haynes helped found), pushed him toward rhythmic complexity that never abandons swing's forward motion. Work with Chick Corea's electric bands added a fusion-scale sense of drama and dynamics, while more recent, genre-blurring projects with BlankFor.ms and Jason Moran show a producer's ear for texture and space rather than pure propulsion. Gilmore has described his own aesthetic on Journey to the New as music that is "thoroughly modern yet not unmoored from tradition" — a fair description of a player equally comfortable anchoring a straight-ahead quartet, driving an electric fusion vamp, or leaving space inside an ambient duo.