International Tax Practitioners

International Tax Practitioners

A Global Alliance of Independent Firms

Professional Profile

Michael O'Brien, Principal | +1 631-368-3110


Meet Michael

Michael is a Tax Principal in an International Tax practice at Sasserath & Zoraian LLP. He has over 25 years of experience in public accounting, most of it gained at PricewaterhouseCoopers and BDO in New York and prior to that, at KPMG in London. Michael has a wide range of private client, business and international experience. He specializes in servicing clients with cross-border tax situations giving rise to offshore structure planning as well as complex expatriate and nonresident alien tax matters. Michael provides cross-border tax compliance and consulting services to multinational companies. He also engages in tax planning and compliance for U.S. beneficiaries of foreign trusts in addition to advising foreign athletes and entertainers. Michael holds Bachelor of Business Studies and Master Degree from Trinity College Dublin and is an Enrolled Agent of the Internal Revenue Service. He is a dual citizen of the U.S. and Ireland and currently resides in Long Island, New York.


  • Tax Principal, Sasserath & Zoraian LLP ( 2010 - Present )
  • Senior Tax Manager, Frank Hirth LLC ( 2008 – 2009 )
  • Senior Tax Manager, CBIZ MHM, LLC ( 2007 - 2008 )
  • Senior Tax Manager, Silverman Linden LLP ( 2005 – 2007 )
  • Senior Tax Director, BDO USA, LLP, New York, NY ( 1996 – 2005 )
  • Senior Tax Associate, PricewaterhouseCoopers LLP ( 1990 – 1996 )
  • Tax Associate, KPMG LLP ( 1987 -1990 )

Professional Affiliations/Certifications

U.S. member of International Tax Practitioners network

Erolled Agent admitted to practice before the Internal Revenue Service

Educational Background

Master of Arts - Trinity College Dublin (1990)

Bachelor of Business Studies (Honors) , Trinity College Dublin (1987)