From quirky, Sundance award-winning films to major studio releases, Rob's writing range has spanned from small, eclectic ensembles to full 85-piece orchestras with choir. His first foray into film was the orchestral score for the indie feature Westender (2003), praised as "...unusually rich" (Variety), "resonant" (Combustible Celluloid), "vibrant and powerful" (dvdtalk.com). Since then, Rob Simonsen has composed, contributed, or assisted on the scores for numerous Hollywood films, working on such titles as Management, Little Miss Sunshine, Capote, Surf's Up, Fracture, Breach, The Nativity Story, Eve and the Fire Horse, Lonely Hearts, and Fox Television's New Amsterdam, among others.

Rob lives and works in Los Angeles.