Antoine was admitted as a solicitor of the supreme Court of NSW in 2010 and the High Court of Australia in 2012. He holds a Bachelor of Law and a Bachelor of Commerce (Government and International Relations) from the University of Sydney, and was awarded the NSW Women Justices' Association Prize for the highest mark in the family law essay.
Prior to working with Barkus Doolan, Antoine worked as a Legal Associate to three judges of the Family Court of Australia, and was later the Research Assistant on the report Patrick Parkinson, For Kids' Sake: Repairing the Social Environment for Australian Children and Young People. He also worked as an Auditor for the Tribunal of the Catholic Church in Sydney, interviewing witnesses to marriage annulment proceedings.
Antoine commenced work with Barkus Doolan in 2012.