After his retirement from government service in 1995, he served as the Joan and James Warburg Chair of International Relations at Simmons College in Boston. His distinguished career as a public servant, writer, historian and commentator on international relations also led him to be a visiting fellow at the Strategic & Defense Studies Centre, the Australian National University in Canberra, the Woodrow Wilson International Center for Scholars, the Carnegie Endowment for International Peace, and the U.S. Institute of Peace. He also served for several years on the New Zealand Press Council.
