Michael de Leeuw

Practice Areas

Michael de Leeuw is a skilled litigator with deep experience in high-profile matters in trial and appellate courts throughout the country and in domestic and international arbitrations. He briefed, argued, and won a major First Amendment case at the United States Supreme Court, Manhattan Community Access Center v. Halleck, in which the Supreme Court reversed the Second Circuit Court of Appeals and clarified the critical constitutional question of when private parties can be deemed “state actors” and thus potentially liable for constitutional violations.

Michael is vice-chair of Cozen O’Connor’s national commercial litigation practice, leads Cozen O’Connor’s appellate practice, and is co-chair of the firm’s securities, and class action practices. He has extensive experience in securities litigation, antitrust litigation, First Amendment and defamation matters, and disputes arising out of mergers and acquisitions. Michael also has an active pro bono practice, and is active in bar and civic and professional organizations.