John Shillingsford


We work as a team to achieve financial success, regardless of the obstacles.

John Shillingsford is a Partner at PKF O’Connor Davies and has over 28 years of professional experience in accounting, auditing, and taxation for closely held businesses.

His wide-ranging client base includes manufacturing, wholesale, distribution, professional service-based companies and employee benefit plans. John aids closely held businesses in succession planning whether by sale or transition to the next generation. He has developed a strategic M&A book for closely held family businesses to facilitate successful transition as well as maximizing value and preserving wealth.

John is past President of the Board of Directors for the NYSSCPA Suffolk Chapter and is past Vice President of the NYSSCPA Statewide Board of Directors.  John is a registered representative who has passed the FINRA Series 7 and 66 exams and holds a New York State Life and Health Insurance License.

He supports two not-for-profit organizations. He serves on the Golf Outing Committee for The Interfaith Nutritional Network that supports the homeless. He also serves on the Annual Luncheon Committee for The Outreach Project which is an organization that assists adolescents with drug and alcohol rehabilitation.

Professional Affiliations & Civic Involvement

  • American Institute of Certified Public Accountants (AICPA)
    • Member, Forensics and Valuation Services
  • New York State Society of Certified Public Accountants (NYSSCPA)
  • Pennsylvania Institute of Certified Public Accountants (PICPA)
  • Association of Certified Fraud Examiners (ACFE)


  • Certified Public Accountant (New York and Pennsylvania)
  • Accredited in Business Valuation (ABV)
  • Certified Fraud Examiner (CFE)