Qualified in three jurisdictions, he has considerable experience in a broad range of matters including corporate/M&A, energy, aviation and defence and international transactions. Niall routinely advises local and international companies in connection with the establishment, maintenance and termination of Abu Dhabi joint ventures, as well as corporate acquisitions and disposals and in connection with local regulatory requirements and developments.

He is consistently rated as one of the leading corporate/M&A lawyers in the UAE. Niall is considered "pragmatic and down to earth" (Legal 500 2003) and praised for his "solutions driven approach" and as someone who "knows his way around" (Chambers Global Report 2003) as well as "excellent and very user friendly" (Chambers Global Report 2007). He is also recommended by Global Counsel 3000.