Mark
O'Sullivan

Mark was previously seconded to the legal department of a large investment bank in London in 2004.  Mark was based in the firm’s Palo Alto office from 2007-2020 and now splits his time between Dublin and Palo Alto.

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 and Finance Magazine.

Mark has also guest lectured on international tax matters at the University of Washington and San Jose State University.

Mark’s experience includes:

• advising overseas clients establishing operations and doing business in and through Ireland; and
• advising extensively on all aspects of international tax planning, including IP planning, cross-border reorganizations and financing transactions.