Born and raised in New York, Brian Killeen has had a healthy obsession with music since as early as he can remember.  By the time he picked up a bass guitar at the age of ten, he was certain of a career as a musician. By grasping at every performance opportunity, and seeking the tutelage of the best educators available, he quickly found himself immersed in the worlds of jazz, rock and everything in between.

At the age of 18, the great Avishai Choen would take him under his wing, leading to performances in New York City's most noted jazz clubs including The Blue Note, Birdland, Small's, and Sweet Basil.  Simultaneously, Killeen would enroll in William Paterson University's famed jazz program, where he would learn to actively double between upright and electric basses.  Out of college, Killeen toured extensively with experimental fun stalwarts ulu, funk/roots-rock outfit the Josh Dion Band, and guitar legend Chuck Loeb, leading to unforgettable performances in the US, Spain, Netherlands, Poland, and Japan.  As Killeen settled into NYC, he embraced freelance life, backing up a variety of artists including Rachel Platten, A Great Big World, Liz Longley, Barnaby Bright, Caleb Hawley, Robbie Gil, Joe Sumner, Bill Evans, and Jim Campilongo.  Killeen continues to back up a host of performers, often joined by long-time collaborators and NYC mainstay Brooklyn Sugar Co.

Killeen feels equally at home in orchestral and theatrical settings.  He has been the long-time bass chair for the Big Apple Circus, where he learned to welcome the unexpected.  He also had the pleasure of being featured on the Today Show, for the Broadway production of The Cher Show.  Killeen has been performing in Schirmer Theatrical and Greenberg Artists' co-productions since 2019, and thoroughly enjoys the opportunity to lay some of the worlds' finest music alongside the country's most acclaimed conductors and symphony orchestras.