Kim is passionate about his work as an orchestrator, arranger, composer, music director and music supervisor in the theatre world. He has orchestrated the Broadway shows Wonderland, Little Women (2005 Drama Desk nomination), Jekyll and Hyde, The Scarlet Pimpernel, The Civil War, additional orchestration on Dracula and the London production of Doctor Dolittle as well as the national and international productions of those shows.

Kim composed and music directed the score for Houston's Alley Theatre production of the Brecht play In The Jungle Of Cities for their 50th anniversary. Other theatre projects include Music of the Night (Flat Rock Playhouse), Inherit the Wind (Alley), Silver Dollar (Goodspeed), Romeo and Juliet the Musical (Ordway), Waiting For The Moon (Lenape), Shiela Valentine (Lenape), Rudolf (Budapest, Tokyo, Vienna), Carmen (Prague), In Nomine Patris (Munich), Monte Cristo (Switzerland), The Rock Tenor (Philly) and Wonderland (Tampa and Houston). He received a best score nomination in 2000 for The Civil War from the National Broadway Theatre Awards.

Kim has arranged and orchestrated the music for three Ford's Theatre Presidential Galas (more on the Photo page) and music supervised their production of The Glory. He also arranged and orchestrated Handel's Messiah Rocks which was featured on PBS. He made his only "official" performances on Broadway in 2001 as a trombone playing Santa for Linda Eder at the Gershwin Theatre.