David S. Zweighaft, CPA/CFF, CFE

David S. Zweighaft, CPA/CFF, CFE

Bates Affiliate, David S. Zweighaft, CPA, CFF, CFE, 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 performing 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:



Bates Group, Expert Witness, July 2013 to Present

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

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

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

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

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

Coopers & Lybrand LLP, New York, NY, Senior Associate, Litigation Consulting and Dispute Resolution Services, August 1990 - December 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 Public Accountant

-          Certified in Financial Forensics

-          Member, Forensic and Litigation Services Committee

-          Member, Anti-Fraud Task Force

Association of Certified Fraud Examiners

New York State Society of Certified Public Accountants

-          Member, Litigation Services Committee (past Committee Chair)

Adjunct Faculty, New York University School of Professional Studies

Editorial Advisor, Journal of Accountancy

Editorial Advisor, The CPA Journal