Department profile
Cozen O'Connor

Litigation: General Commercial

USA Guide 2026 : New York


Cozen O'Connor

Rankings

About

Provided by Cozen O'Connor

With over 200 highly respected litigators in the United States and Canada, including numerous fellows of the American College of Trial Lawyers, Cozen O’Connor is a go-to firm for sophisticated clients with complex and consequential business litigation. Our clients include public and private companies, startups, corporate boards and committees, directors and officers, nonprofits, trade associations, and government entities.

Our attorneys litigate myriad claims, including corporate governance and partnership disputes; securities and financial services litigation; breach of contract; business torts; data privacy and cybersecurity breaches; unfair business practices; antitrust; construction; class actions; product liability; criminal defense & government investigations; international arbitration; and real estate. We practice before judges across nearly every state and Canada, are well-versed in the procedural norms in their courtrooms, and win cases in the most challenging jurisdictions. Our commitment to hands-on trial practice is unusual in the current legal marketplace, even among prestigious peer firms. Our record of success in court contributed to the Commercial Litigation practice being selected as a Litigation Department of the Year finalist in 2023 by The American Lawyer, the firm being named a Law360 Powerhouse in 2014, 2018, and 2022-2024, Pennsylvania Litigation Department of the Year by American Lawyer, and Law Firm of the Year by The Legal Intelligencer. 

Chambers Review

Provided by Chambers

Litigation: General Commercial - New York


What the Team is Known For
Cozen O'Connor boasts a broad-based commercial litigation practice hosting attorneys who are well versed in antitrust matters as well as contractual disputes, IP litigation and securities cases. It also excels in defending corporate clients in litigation arising out of tort claims. It offers additional notable strengths in appellate law and criminal proceedings.

Work Highlights

Provided by Chambers

  • Cozen O’Connor continued to represent the Council for Responsible Nutrition in its challenge to a New York law that bars the sale of dietary supplements to minors where the dietary supplement is “labeled, marketed, or otherwise represented for the purpose of achieving weight loss or muscle building.”

Strengths

Provided by Chambers

  • Cozen O'Connor has a great team and great bench strength. The firm is business-minded and oriented.

    Litigation: General Commercial respondentUSA
  • Cozen O'Connor is superb on all fronts. Its legal work is spotless. The team is great at writing and has a deep understanding of the law, not just in terms of chapter and verse, but also conceptually and practically. The firm has great depth and skill on a whole range of matters.

    Litigation: General Commercial respondentUSA
  • Cozen O'Connor is very knowledgeable in this legal area, offering sound advice and legal strategy.

    Litigation: General Commercial respondentUSA

Notable Practitioners

Provided by Chambers

  • Band 4Michael de Leeuw
    Band 4Michael de Leeuw

    Michael de Leeuw

    Michael de Leeuw is a skilled trial and appellate lawyer with experience handling securities, antitrust and wider commercial matters, with several appearances before the US Supreme Court.
    • Michael is an amazing litigator and legal theorist. He is engaged with case law and contemporary legal issues and theory.

      Litigation: General Commercial respondentUSA
    • Michael is incredibly responsive and knowledgeable.

      Litigation: General Commercial respondentUSA

Ranked Individuals at Cozen O'Connor (1)

New York

Members

Provided by Cozen O'Connor

What success is built on

Chambers is the leading data and intelligence partner for the legal sector.

Explore thought leadership