Michael O'Brien, EA, Tax Principal

Michael O'Brien EA

Email: mobrien@sasscpas.com
Phone: (631) 368-3110 ext. 114

Michael O’Brien is a Tax Principal in Sasserath & Co.'s highly regarded international tax practice and is passionate about assisting clients with global business opportunities. As our economy becomes increasingly global, Michael’s wealth of experience in cross-border tax situations, offshore structure planning, and complex expatriate and nonresident alien tax matters is invaluable to our clients both at home and abroad.

As an enrolled agent with the IRS, Michael also puts his firsthand knowledge of U.S. tax law and regulatory requirements to work for his clients. He engages in tax planning and compliance for U.S. beneficiaries of foreign trusts in addition to advising athletes and entertainers on U.S. and international tax matters.

Michael has over 25 years of experience in public accounting, much of it gained at PwC and BDO in New York and prior to that, at KPMG in London, helping him develop a wide range of private client, business, and international experience.

Michael serves on the Leadership Team at Sasserath & Co. He is a dual citizen of the U.S. and Ireland and calls Long Island home.


B.B.S., M.A., Trinity College Dublin


Enrolled Agent, Internal Revenue Service (IRS)


Co-founder of International Tax Practitioners – a global alliance of independent firms

Lectures & Presentations

  • British America Business
  • Society for Human Resource Management
  • Long Island Tax Professionals Symposium