Rob Gardner began his musical career in high school as a member of and arranger for the acapella band Two Five Nine. The group recorded five albums together and, while in college, performed and toured around the country. From there, Rob began composing original works for film, theater and the concert stage. He is the author of a handful of stage musicals, including Blackbeard, The Price of Freedom, and 12 Princesses. Rob has also composed several sacred music oratorios, including Lamb of God, which was originally recorded by the London Symphony Orchestra and Spire Chorus, and is regularly performed around the world. In 2021, Rob produced an intimate concert film of the work that was released in movie theaters and premiered in the top 10 films in the U.S. He was instrumental in the musical revisions for Mesa Easter Pageant.

In 2015, Rob joined fellow Two Five Nine alums Drex Davis and McKane Davis to produce a project called Cinematic Pop, recording several albums and producing sold-out live shows on the regular.

Rob has a bachelor's degree in Management and Entrepreneurship from Brigham Young University and attended the University of Southern California for graduate studies in the prestigious Scoring for Motion Pictures and Television program.