Arthur has worked for many years in both commercial Insolvency and commercial Litigation disciplines, more recently he has become heavily involved in personal insolvency. He is Head of the Bankruptcy Department in the Irish Mortgage Holders Organisation (a charitable institution ) and also the Company Secretary. He is also an Accredited Mediator.

He has represented many clients in the Commercial Court (High Court) and he represented both Plaintiffs in the two largest actions ever to come before the Irish Courts. The Promissory Notes cases (which are challenges to the Constitutionality of the manner in which the Irish Government gave promissory notes with a value of in excess of €31 Billion to Anglo Irish Bank and other Irish Institutions) the cases taken first by Mr. David Hall and secondly By TD Joan Collins are both currently before the Supreme Court.