Kim is passionate about his work as a composer, orchestrator, arranger, music director and music supervisor in the theatre world. As an associate artist with the Ford's Theatre in Washington, DC he arranges and conducts their yearly presidential gala and orchestrates productions throughout the regular season.

He has orchestrated the Broadway shows Wonderland, Little Women (Drama Desk nomination), Jekyll and Hyde (original and revival), The Scarlet Pimpernel, The Civil War, Linda Eder at the Gershwin and the London production of Doctor Dolittle. He is music supervisor and assistant conductor for Rocktopia which plays a limited Broadway engagement in the Spring of 2018.

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. International projects include Rudolf, Carmen, In Nomine Patris, Monte Cristo and Maury Yeston's Phantom of the Opera. From the National Broadway Theatre Awards, he received a Best Score nomination in 2000 for The Civil War.

Kim has been the supervising orchestrator for Broadway Records' productions, From Broadway with Love for both Sandy Hook, Connecticut and Orlando, Florida; he served most recently as Supervising Orchestrator for From Broadway with Love Parkland USA, in strong solidarity with compassion for every child, teen, adult, and family whose lives are forever altered by these tragedies.