Our People

Thomas A. O'Sullivan, CPA, CFE

Ann Arbor

Thomas A. O’Sullivan is the Managing Principal of Yeo & Yeo's Ann Arbor office. He has more than 23 years of certified public accounting experience which includes business consulting, tax preparation and audit experience. He is a member of the firm’s Tax, Health Care, Death Care, Litigation and Construction Teams.


  • Business consulting for management, financial reporting and tax issues with strong emphasis on the retail and wholesale sectors
  • Fraud investigation             
  • Internal controls consulting

Professional Certifications and Education

  • Certified Public Accountant (CPA)
  • Certified Fraud Examiner (CFE)
  • Eastern Michigan University, Bachelor of Business Administration, Accounting

Professional Membership

  • Michigan Association of CPAs
  • American Institute of CPAs
  • Michigan Manufacturers Association
  • Association of Certified Fraud Examiners

Community Involvement

  • Ann Arbor/Ypsilanti Regional Chamber 
  • Saline Chamber of Commerce
  • United Way of Washtenaw County
  • Member of St. Francis of Assisi Parish