In 1964, Menzies nominated Barwick as his choice to replace the retiring Owen Dixon as Chief Justice. Over the next 17 years, the Barwick court would decide many significant constitutional cases, including a significant broadening of the corporations power and several cases regarding the constitutional basis of taxation. Barwick also played a small but significant role in the 1975 constitutional crisis, advising Governor-General John Kerr that it was within his powers to dismiss Prime Minister Gough Whitlam from office. He retired from the court at the age of 77, but remained a public figure until his death at the age of 94. Outside of his professional career, he also served as the inaugural president of the Australian Conservation Foundation.