 Kalmansohn later served as an Assistant U.S. Attorney (Criminal Division) for the Central District of California, where he also served as an Assistant Division Chief for Trial Training.In 1987, Kalmansohn left a partnership at the Beverly Hills law firm of Cooper, Epstein & Hurewitz to serve as Director of North American Anti-Piracy Operations for the Motion Picture Association of America.He later served as a founding partner of McPherson & Kalmansohn, LLP, and subsequently of Kalmansohn & Andersen, LLP, where he is engaged in an entertainment and intellectual property law practice.