Professional Headshot of Mark Ellenbogen

Mark Ellenbogen

Assurance Principal

CPA

Executive Summary

Mark Ellenbogen is an Assurance Principal and BDO’s incoming Chief Operating Officer (COO). Mark will transition to the COO role effective July 1, 2024.

Mark has over 30 years of public accounting experience working with clients in various industries including biotechnology, telecommunications, media, manufacturing, non-profit, education, publishing, software and technology, and professional services. Mark has consulted with clients on a variety of accounting and operational issues, including mergers and acquisitions. He has extensive experience with due diligence, opening balance sheet audits and purchase price allocations. Mark has also conducted training for both financial and non-financial audiences on a variety of audit and accounting issues.

He previously led BDO Bethesda’s Assurance practice and, following its 2015 combination with BDO McLean, was named Office Managing Partner of the BDO Greater Washington D.C. Assurance practice. In 2016, he was named Atlantic Assurance Regional Managing Partner. He also served as the Public Sector Practice National Leader and as the Assistant Regional Technical Director for the firm’s Mid-Atlantic region. 

As a BDO board member, Mark chaired its Governance Committee and was an instrumental figure in the establishment of the firm’s Employee Stock Ownership Plan. He has also been part of the Board of Directors Nominating Committee six times, serving as chair twice.

  • American Institute of Certified Public Accountants
  • Greater Washington Society of CPAs
  • Northern Virginia Technology Council

  • Postgraduate Diploma, Accounting, University of Cape Town
  • B.B.S., University of Cape Town (Honors)



  • Northern Virginia Technology Council, Board member
  • First Tee of Greater Washington DC, Board member
  • Light the Night, Executive Committee member