
Litigation: General Commercial: Highly Regarded
USA Guide 2026 : New York
Rankings

Ranked Individual
Ranked Individual
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
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: Highly Regarded respondentUSACozen 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: Highly Regarded respondentUSACozen O'Connor is very knowledgeable in this legal area, offering sound advice and legal strategy.
Litigation: General Commercial: Highly Regarded respondentUSA
Notable Practitioners
Provided by Chambers
Band 4 
Band 4 
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: Highly Regarded respondentUSAMichael is incredibly responsive and knowledgeable.
Litigation: General Commercial: Highly Regarded respondentUSA
Ranked Individuals at Cozen O'Connor (1)
Members
Provided by Cozen O'Connor

Michael de Leeuw
View profile of Michael de Leeuw
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