Who is Marvyn Kornberg? Marvyn Kornberg is a prominent American criminal defense attorney, well-known for his vigorous representation of clients in high-profile cases. Over his career, Kornberg has garnered a reputation for his meticulous and aggressive defense strategies, which have been pivotal in securing favorable outcomes for many of his clients. Kornberg's prominence in the legal field is partly due to his involvement in several sensational cases that have captured public and media attention. One of his notable clients was John Gotti Jr., son of the infamous Gambino crime family boss John Gotti. Kornberg's role in defending Gotti Jr. against charges related to organized crime further solidified his standing as a formidable defense attorney capable of handling complex and highly publicized cases.