Quintin was admitted as a lawyer in 2012. He commenced practice at the NSW Bar in 2014.
He is also a postgraduate unit of study coordinator and adjunct senior lecturer at the University of Sydney. He has authored a textbook in negotiation.
At the Bar, Quintin has a general practice. He regularly appears in commercial, tax, equity, insurance, maritime, construction, tort and crime matters. He is experienced in representative proceedings.
He has appeared in the NSW Civil and Administrative Tribunal, Local Court, District Court and Supreme Court (including the Court of Appeal). Quintin has appeared in Commonwealth Tribunals, the Federal Circuit Court, the Federal Court of Australia (including in the Full Court) and the High Court. He has also appeared in arbitration.
A full list of his publications is available here.