Rowan has a broad practice in public and commercial law, including tax law.

Drawing on his expertise in administrative law and statutory interpretation, he regularly advises on matters of federal and state tax law.  He also appears in tribunals and courts for both revenue authorities and taxpayers, including in two leading High Court tax cases: Commissioner of Taxation v Thomas (2018) 264 CLR 382 and Comptroller-General of Customs v Zappia (2018) 265 CLR 416.

Before coming to the Bar, Rowan served as Counsel Assisting the Commonwealth Solicitor-General, Dr Stephen Donaguhe QC, and as Associate to the Hon Justice Virginia Bell AC of the High Court of Australia. He also practised as a commercial solicitor at King & Wood Mallesons and as a senior solicitor in the constitutional and administrative law team at the NSW Crown Solicitor's Office.

Rowan holds degrees in Arts and Law from the University of Melbourne, which he attended as a Commonwealth Scholar, and a Bachelor of Civil Law from the University of Oxford, where he studied as an Allan Myers QC Scholar.