Born and raised in Cleveland, Ohio, Zachary Keum began playing the cello at the age of seven. Zachary earned his Bachelor of Music degree in Cello Performance from Northwestern University, where he studied with Hans Jørgen Jensen. He continued his education to earn a Master of Music degree and Graduate Diploma in Cello Performance at the New England Conservatory, studying with Blaise Déjardin and Yeesun Kim.

Zachary has appeared in various orchestras in Colorado. He currently serves as the associate principal with the Greeley Philharmonic Orchestra and as a section cellist with the Boulder Symphony and Music Academy, the Symphony of the Rockies, and The Loveland Orchestra. Zachary also serves as a substitute cellist with the Colorado Symphony and Fort Collins Symphony.

Outside his musical work, Zachary enjoys making art and origami in his free time.