Peter completed his articles under Mr. Frank Galbally in 1974 and has practised exclusively as a criminal defence lawyer since 1975. He was made a Galbally & O’Bryan Partner in 1989 and is an Accredited Criminal Law Specialist.
Peter retired from the partnership in December of 2021 and now acts as a Consultant in the firm's criminal defence law division.
Peter is widely regarded as one of the leading criminal law practitioners in Victoria and has been involved in many high profile cases over his career. He has represented clients in the Children’s Court, Magistrates’ Court, County Court, Supreme Court, Court of Appeal, Federal Court of Australia and High Court of Australia.