In 1973, Winterton won a
Fulbright scholarship to study law at
Columbia University in New York City, where he served as an associate-in-law, teaching legal research and writing, and international law. While at Columbia, Winterton was interviewed for a position at the Law Faculty of the University of New South Wales, and he returned to Australia in 1975 to take up an appointment as a Senior Lecturer. In 1983, Winterton completed his Doctorate of Juridical Science (JSD) at Columbia. His thesis on the executive power of the Commonwealth of Australia became the core of
Parliament, the Executive and the Governor-General, which was published by Melbourne University Press in 1983, and which is still regarded as the leading text on the subject. In 1998, Winterton founded the
Constitutional Law and Policy Review, remaining its general editor until his death. At UNSW, Winterton taught Public Law, Succession and Advanced Equity, Advanced Administrative Law, International Law and, ultimately, Federal Constitutional Law, the
High Court of Australia,
Comparative Law, Legal History and Comparative Constitutional Law. He was promoted to professor of law, and was awarded a Jubilee Medallion in 1999. The University of Western Australia awarded him the honorary degree of Doctor of Laws in 2007. == Illness and death ==