Mark O'Sullivan

Matheson, Dublin

Mark O’Sullivan is a partner in the firm’s Tax Department and advises on all aspects of Irish corporate taxation. His primary focus is advising overseas clients establishing operations and doing business in and through Ireland. Mark also advises extensively on all aspects of international tax planning, including IP planning, cross-border reorganizations and financing transactions. Mark was formerly based in Matheson’s US west coast offices in Palo Alto and San Francisco. Mark is a vice-chair of the Foreign Lawyer’s Forum of the Tax Section of the American Bar Association (ABA), and is also actively involved in the International Fiscal Association (IFA). Mark regularly speaks on international tax issues and has also published articles in Tax Notes International, the International Tax Review, the Irish Taxation Review, IFLR, BNA, IFC and Finance Magazine.