Michael B. de Leeuw

Vice Chair, Business Litigation

New York

(212) 908-1331

(212) 509-9492

Michael is a skilled litigator whose experience includes a variety of high-profile matters spanning many areas of law in federal and state courts throughout the country. He has extensive experience in securities litigation, antitrust litigation, First Amendment and defamation matters, and disputes arising out of mergers and acquisitions, both at the trial and appellate levels. Michael is a member in Cozen O’Connor’s Commercial Litigation Department and vice chair of the firm’s Business Litigation Group.

In 2019, Michael briefed, argued, and won a major First Amendment case at the United States Supreme Court:  In Manhattan Community Access Center v. Halleck, 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 active in bar and civic organizations. He is on the board of the Lawyers' Committee for Civil Rights Under Law; served as co-chair of the Antitrust Litigation Committee in the Litigation Section of the ABA; and is also an elected member and vice president of the Board of Education in Glen Ridge, N.J.

Michael earned his law degree from Rutgers University School of Law, graduating with honors and as a member of the order of the coif. He was editor-in-chief of the Rutgers Computer & Technology Law Journal. He received his bachelor's degree from Montclair State University, majoring in philosophy and then continued his study of philosophy in graduate school at Rutgers University.

Experience

News

Chambers Ranks 86 Cozen O’Connor Lawyers, 22 Practice Areas in Chambers USA 2022 Guide

June 02, 2022

Chambers USA, the leading annual guide to the top lawyers and law firms in the United States, has ranked 86 Cozen O’Connor lawyers as leaders in their respective fields in the guide’s 2022 edition.

Super Lawyers Recognizes 17 Cozen O’Connor Attorneys in New York

October 04, 2021

Super Lawyers has named 17 Cozen O’Connor attorneys to its 2021 New York Super Lawyers and Rising Stars list.

Cozen O'Connor Attorneys Win Securities Fraud Case in Del. Federal Court's First In-Person Trial

October 04, 2021

Martin Bloor and Matthew Elkin were quoted in an article published by the Delaware Court Insider, which discusses a securities fraud case victory.

Trump Needs Damning Evidence To Keep Big Tech Suits Alive

July 09, 2021

Michael de Leeuw was quoted in an article published by Law360 that discusses how former President Donald Trump filed three class actions on Wednesday alleging illegal social media censorship.

In Trump's world, only his speech is free

July 09, 2021

Michael de Leeuw was quoted in an article published by NBC News which discusses the former president's lawsuits against social media giants Facebook, Twitter, and Google.

Appellate Hot List 2020: Cozen O'Connor

November 01, 2020

Michael de Leeuw was featured in a Q&A held by the National Law Journal discussing Cozen O'Connor being named to the NLJ 2020 Appellate Hot List.

Myriad Section 230 Bills Show Agreement Still Out Of Reach

October 16, 2020

Michael de Leeuw was quoted in a Law360 article discussing how a politically neutral proposal such as the Pact Act will likely get more traction than other bills that seek to impose stricter oversight of social media platforms.

Super Lawyers Recognizes 21 Cozen O’Connor Attorneys in New York

September 29, 2020

Super Lawyers has named 21 Cozen O’Connor attorneys to its 2020 New York Super Lawyers and Rising Stars list.

House Dems Urge Justices To Hear Pot Legalization Fight

September 15, 2020

Michael de Leeuw was featured in a Law360 article in which he called the federal government's cannabis prohibition a "disastrous anachronism that must be addressed immediately."

17 Cozen O’Connor Attorneys Recognized as New York Super Lawyers and Rising Stars

September 27, 2019

Super Lawyers has named 17 Cozen O'Connor attorneys to its 2019 New York Super Lawyers and Rising Stars list.

Cozen O’Connor Team Wins Landmark First Amendment Ruling

June 21, 2019

The team includes Michael de Leeuw, Stuart Shorenstein, Tamar Wise, Stephen Miller, Jesse Loffler, William Lesser, and Anna Hanke.

18 Cozen O'Connor Attorneys Named New York Metro Super Lawyers and Rising Stars

September 21, 2018

Super Lawyers has named 17 Cozen O'Connor attorneys to its 2018 New York Super Lawyers and Rising Stars list. Twelve were recognized as Super Lawyers and five were named "Rising Stars."

12 Cozen O’Connor Attorneys Named 2017 New York Metro Super Lawyers and Rising Stars

October 19, 2017

Super Lawyers has named 12 attorneys at Cozen O’Connor to its 2017 lists of top practitioners in the New York metro area. Six were recognized as Super Lawyers and six were named “Rising Stars,” a list that recognizes attorneys under the age of 40.

19 Cozen O'Connor Attorneys Recognized as New York Super Lawyers and Rising Stars

October 05, 2016

The 2016 New York Metro edition of Super Lawyers Magazine, published by Thomson Reuters, has named 21 Cozen O’Connor attorneys to its list of Super Lawyers and Rising Stars.

21 Cozen O'Connor Attorneys Recognized as New York Super Lawyers and Rising Stars

October 05, 2015

The 2015 New York Metro edition of Super Lawyers Magazine, published by Thomson Reuters, has named 21 Cozen O’Connor attorneys to its list of Super Lawyers and Rising Stars.

Publications

A Long, Broken Arm Internet Defamation & Personal Jurisdiction

August 07, 2020

Michael de Leeuw and Tamar Wise contributed an article to the ACC New York City Chapter newsletter discussing issues associated with personal jurisdiction and the Internet.

The Constitution and Religious Gatherings [The National Law Journal]

June 24, 2020

Michael de Leeuw and Tamar Wise contributed an article to The National Law Journal discussing the constitutional limits on infringements on religious gatherings.

COVID-Driven Commercial Litigation – What Businesses Can Expect

May 08, 2020

Adam Schlatner and Michael de Leeuw discuss potential COVID-19 related litigation, based on what is already happening and the legacy of other downturns.

Litigation During the Pandemic: Remote Depositions [Alert]

April 23, 2020

Michael de Leeuw, Adam Schlatner, and Amy Alderfer discuss things to consider before taking your first remote deposition.

Supreme Court Limits First Amendment Exposure of Social Media Giants [Silicon Valley Business Journal]

July 11, 2019

Michael B. de Leeuw and Tamar Wise contributed an article to Silicon Valley Business Journal discussing the Manhattan Community Access Center v. Halleck (MCAC) case.

‘Possession, Custody or Control’—Got It?

April 11, 2018

Michael de Leeuw, a member in the firm's Commercial Litigation Department, authored, " ‘Possession, Custody or Control’—Got It?" for the New York Law Journal.

Education

  • Rutgers University School of Law—Newark, J.D., cum laude, 1996
  • Montclair State University, B.A., 1989

Awards & Honors

New York Super Lawyer 2014-2022. This award is conferred by Super Lawyers. A description of the selection methodology can be found here. No aspect of this advertisement has been approved by the Supreme Court of New Jersey.

Chambers & Partners USA: Litigation: General Commercial, 2022. This award is conferred by Chambers & Partners. A description of the selection methodology can be found here. No aspect of this advertisement has been approved by the Supreme Court of New Jersey.

Burton Award for Excellence in Legal Writing

Legal 500

Benchmark

  • New Jersey
  • New York
  • U.S. Supreme Court
  • U.S. Court of Appeals for the Second Circuit
  • U.S. Court of Appeals for the Fifth Circuit
  • U.S. Court of Appeals for the Eleventh Circuit
  • U.S. District Court -- Southern District of New York
  • U.S. District Court -- Northern District of New York
  • U.S. District Court -- New Jersey
  • U.S. District Court -- Eastern District of Michigan
  • U.S. District Court -- Southern District of Mississippi