Print Friendly, PDF & Email

Thomas O’Sullivan, CPA, CFE

Managing Principal

CPAs & Advisors

Thomas 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, Construction and Cannabis Teams.


    • Business consulting for management, financial reporting and tax issues with strong emphasis on the retail and wholesale sectors
    • Specialization in Cannabis advisory, tax and accounting solutions, including license application consulting, entity selection and access to capital assistance.
    • Fraud investigation and prevention         
    • 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
    • Michigan Cannabis Industry Association

Community Involvement

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