David S. Zweighaft, CPA/CFF, CFE

David S. Zweighaft, CPA/CFF, CFE

David S. Zweighaft, CPA, CFF, CFE, is a Affiliate Expert at Bates Group who is a Partner with RSZ Forensic Associates, a New York City-based forensic accounting and litigation consulting firm. Mr. Zweighaft is a fraud subject matter expert and since 1993 has served the legal and financial services communities in both consulting and expert witness services. He has significant experience in accounting, auditing, finance, and project management in diverse industries. Mr. Zweighaft is well-versed in accounting policies and procedures, financial reporting with an emphasis on investigating financial statement misrepresentations, and assessing the effectiveness of internal controls and their impact on operational efficiencies.

Mr. Zweighaft is responsible for providing RSZ Forensic’s law firm clients with litigation consulting services, including conducting investigations, performing analyses, calculating economic damages, providing expert witness testimony, and conducting due diligence reviews. An experienced expert witness, he has testified in depositions before arbitration panels and judicial hearing officers, as well as in state and federal courts. Mr. Zweighaft’s background includes four years with a risk management advisory firm as the Associate Director of their Fraud Risk Management practice and over thirteen years with global public accounting firms focusing on litigation and forensic services. He also assisted the United States Department of Justice (Southern District of New York) for two and a half years as a Senior Asset Forfeiture Financial Specialist.

Mr. Zweighaft has authored numerous articles about fraud and accounting issues, and has given presentations to many professional groups. He has been an Adjunct Instructor at New York University’s School of Continuing and Professional Studies, where he taught auditing, forensic accounting, and litigation consulting. He has also been a Faculty Instructor at international conferences for anti-fraud professionals.


David S. Zweighaft, CPA/CFF, CFE

A Consultant and subject matter expert in these services:



RSZ Forensic Associates LLC, New York, NY, Managing Partner, 2017 - Present

Bates Group, Expert Witness, 2013 - Present

DSZ Forensic Accounting & Consulting Services, LLC, New York, NY, Principal, 2008 - Present

RGL Forensics, New York, NY, Director, 2009 - 2009

Protiviti, Inc., New York, NY, Associate Director, Financial Investigations & Litigation Consulting Services, 2004 -2007

Lazar Levine & Felix LLP, New York, NY, Principal - Litigation and Forensic Services, 2000 - 2004

Deloitte & Touche LLP, New York, NY, Manager, Forensic Accounting and Corporate Investigative Services Practice, 1996 - 2000

Coopers & Lybrand LLP, New York, NY, Senior Associate, Litigation Consulting and Dispute Resolution Services, 1990 - 1996


Lubin Graduate School of Business at Pace University, Master of Science in Accounting, September 1990

Georgia Institute of Technology, Bachelor of Science in Industrial Management, August 1984

Industrial & Organizational Psychology, Certificate


American Institute of Certified Public Accountants

Certified in Financial Forensics

Member, Forensic and Litigation Services National Committee

Chair, Anti-Fraud Task Force

Co-chair, Emerging Technology Task Force

Editorial Reviewer, Journal of Accountancy

New York State Society of Certified Public Accountants

Chair, NYSSCPA Litigation Services Committee 2005 – 2007

Co-Chair, Annual Anti-Fraud/Anti-Money Laundering Conference (various years 2002 – 2014)

Editorial Reviewer, CPA Journal

Association of Certified Fraud Examiners - Member

Adjunct Instructor, New York University School of Continuing and Professional Studies

  • Introduction to Auditing and Assurance Services
  • Introduction to Litigation Consulting and Forensic Accounting

The Reform Temple of Forest Hills – Board of Trustees, Finance Committee, Executive Committee (2006-2009), Vice President (2008-2009)

Boy Scouts of America, Troop 96 - Troop Committee

Sebago Canoe & Kayak Club Board of Directors (2005), Audit Committee Chair (2005 – 2014)

EPIC Theatre Ensemble - Board of Directors: Treasurer, Audit Committee Chair