Rory Mullan focuses his practice on tax matters, including domicile and residence and offshore tax work. "He is incredibly bright and a real fighter for his clients. He is the best senior junior at the tax Bar," states a fellow barrister, adding: "He has a strategic nose and incredible intellectual rigour; he really stands out." One instructing solicitor enthuses: "Rory provides an absolutely superb service, I would never go anywhere else for tax advice. His advice is insightful as well as practical, and Rory never fails to go the extra mile for his clients."