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David S. Zweighaft, CPA/CFF, CFE

David S. Zweighaft, CPA/CFF, CFE

David S. Zweighaft, CPA, CFF, CFE, is a Bates Group Consulting and Testifying Expert 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 is a consultant and subject matter expert in these Practice Areas and Services:



RSZ Forensic Associates LLC, Managing Partner, New York, NY, 2017 - Present
Bates Group LLC, Expert Witness, 2013 - Present
DSZ Forensic Accounting & Consulting Services, LLC, Principal, New York, NY, 2008 - Present
RGL Forensics, Director, New York, NY, 2009 - 2009
Protiviti, Inc., Associate Director, Financial Investigations & Litigation Consulting Services, New York, NY, 2004 -2007
Lazar Levine & Felix LLP, Principal - Litigation and Forensic Services, New York, NY, 2000 - 2004
Deloitte & Touche LLP, Manager, Forensic Accounting and Corporate Investigative Services Practice, New York, NY, 1996 - 2000
Coopers & Lybrand LLP, Senior Associate, Litigation Consulting and Dispute Resolution Services, New York, NY, 1990 - 1996


Master of Science (MS), Accounting, Lubin Graduate School of Business at Pace University, New York, NY
Bachelor of Science (BS), Industrial Management, Georgia Institute of Technology, Atlanta, GA
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