Matthew L. Mazur


Matthew L. Mazur


London | 160 Queen Victoria Street, London EC4V 4QQ
+44 20 7184 7487 | +44 20 7184 7001

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Matthew L. Mazur is an experienced criminal defense attorney who represents individuals and companies in government investigations and enforcement proceedings, internal investigations, and related litigation.  He frequently advises clients in multi-agency and cross-border investigations by the U.S. Department of Justice (DOJ), the U.S. Securities and Exchange Commission (SEC), and the Commodities Futures Trading Commission (CFTC).  He also litigates complex commercial disputes in U.S. federal and state courts, as well as commercial arbitrations.

In 2015, Mr. Mazur was recognized as a “Rising Star” by the New York Law Journal, placing him among a select group of lawyers under age 40 who have established a record of accomplishments, as well as demonstrated that they are top contributors to the practice of law and their communities.  Since 2017, he has been listed as a top-rated white collar crimes attorney by Super Lawyers, a publication of Thompson Reuters, following his selection as a “Rising Star” in each of 2014, 2015, and 2016.

Prior to joining Dechert in 2011, Mr. Mazur served for seven years as a public defender at the Public Defender Service for the District of Columbia and then the Office of the Appellate Defender in New York City.  He has been lead defense counsel or co-counsel in over twenty jury trials and bench trials, and he has briefed and argued over twenty appeals before the New York Court of Appeals, the Appellate Division of the New York Supreme Court, and the United States Court of Appeals for the Second Circuit.

Mr. Mazur regularly provides pro bono representation to indigent men and women in criminal matters in federal and state court.  In March 2015, he won a complete acquittal after a two-week jury trial for a pro bono client charged with armed robbery in Queens Supreme Court.  In November 2016, he won another complete dismissal of child abuse allegations after a bench trial for a pro bono client in the New York Family Court.

Mr. Mazur serves on the Board of Trustees of the Neighborhood Defender Service of Harlem, a community-based public defender serving residents of Upper Manhattan.


Government Investigations and Related Litigation

  • Jon S. Corzine, former Governor of New Jersey, U.S. Senator, and CEO of MF Global, in investigations by the DOJ, SEC, CFTC, the Financial Industry Regulatory Authority (FINRA), and the U.S. Congress, as well as all related civil litigation.
  • Senior broker in antitrust and fraud investigation by DOJ and UK Financial Conduct Authority (FCA).
  • Senior executive of Swiss bank in tax-related DOJ investigation.
  • Senior bank executive in DOJ anti-money laundering and bribery investigation.
  • CEO of a multinational financial services firm in connection with SEC investigation into valuation of private equity investments.
  • Broker-dealer and employees in SEC investigation of trading activity and net capital.
  • Boutique investment bank in investigation by the New York District Attorney’s Office involving suspected misappropriation of trade secrets.
  • 12 police union officials charged with “ticket-fixing” in New York State Supreme Court.

Internal Investigations

  • Investigation on behalf of special board committee into bribery allegations against CEO.
  • Investigation of alleged financial misconduct by CEO of credit union.
  • Investigation of alleged ethical and financial misconduct by senior executive of a large hospital.

Commercial Litigation and Arbitration

  • Microsoft Corp. in litigation against Samsung Electronics Corp. and Acacia Research Corp. in the United States District Court for the Southern District of New York. 
  • UK manufacturer in the Southern District of New York in breach of contract action by a U.S. distributor.
  • Sellers of a family business in the Commercial Division of the New York State Supreme Court against the buyer’s allegations of fraud.
  • Investment adviser in commercial arbitration brought by former marketing agent.
  • Hedge fund in commercial arbitration brought by retired partner.
  • Yale University, B.A., 1998
  • Harvard Law School, J.D., 2004
  • New York
  • District of Columbia
  • United States Court of Appeals for the Second Circuit
  • United States Court of Appeals for the Third Circuit
  • United States District Court for the Eastern District of New York
  • United States District Court for the Southern District of New York
  • National Association of Criminal Defense Lawyers