John Greig Latham was born in 1877 in Melbourne and grew up in a household that valued education, civic duty, and intellectual seriousness. He attended Scotch College and went on to the University of Melbourne, where he studied arts and law with outstanding results. After graduating with honours in the early years of the twentieth century, he was admitted to the Victorian Bar in 1904. From the beginning, Latham showed a disciplined, scholarly approach to the law and an ambition to place himself at the centre of national thought.

His legal practice developed steadily, focusing on constitutional law, administrative matters, and emerging questions of federal power. Latham was admired for the clarity of his legal reasoning and his austere, methodical advocacy. He did not rely on courtroom theatrics. Instead, he built arguments slowly and carefully, guiding judges through a process of logic that was difficult to rebut. Clients trusted him for his measured advice and judges respected his ability to link detailed statutory language with broad constitutional themes.

By the 1920s he was considered among the most accomplished constitutional lawyers in Australia. He took silk in 1922 and frequently appeared before the High Court in cases concerning federal–state relations, Commonwealth powers, and civil liberties. His influence on constitutional interpretation during this period was significant, and many of his arguments became foundations for later judicial reasoning.

Latham entered politics in 1922 and served as Attorney-General and Minister for External Affairs in the Bruce Government. He played a key role in shaping the legislative program of the interwar period, and later became Leader of the Opposition. Though his political style was restrained and intellectual, he remained committed to using legal reasoning as a tool of policy. In 1935 he left Parliament and was appointed Chief Justice of the High Court of Australia, a position he held until 1952.

As Chief Justice, Latham brought a conservative, formalist approach to constitutional interpretation, favouring clear divisions of power and judicial restraint. He retired with honour and died in 1964, having left a legacy of disciplined advocacy, public service, and thoughtful judicial leadership. His career reflected a belief in law as a structure for reasoned debate and principled governance.