Peter retired from the Army in July 2008 after a 37-year career, concluding with the rank of Lieutenant General in the appointment of the Chief of Army. Since leaving the Army, Peter has joined the University of Canberra as a Professor, where he lectures on Defence and security-related topics. He is a member of several advisory, commercial and charity boards. Peter is a commentator on Defence and security matters on television and radio and in the print media in Australia.