He is one of the current authors of Meagher, Gummow & Lehane's Equity: Doctrines and Remedies.
[1] He then served as associate to Justice Gummow, then a Judge of the Federal Court of Australia.
He subsequently served as associate to the Chief Justice of the High Court of Australia, Sir Anthony Mason.
Leeming was called to the bar in 1995 and was appointed a Senior Counsel in 2006.
Leeming is married to Australian constitutional law academic Anne Twomey.