Marvin Amoroso Marvin Amoroso is a senior partner in the Patton Trial Group Ontario office. Mr. Amoroso has been practicing law for over 20 years and he is an experienced trial attorney, with a focus on Civil Litigation Defense, representing insurance companies and their insureds in complex first-party, third-party, and SIU cases. His insurance defense experience includes automobile liability, premises liability, and product liability. Mr. Amoroso is also experienced in subrogation, insurance coverage, and business litigation. He has successfully represented clients in trial, and arbitration.