Cozen O’Connor: Marquis, Milton

Milton A. Marquis


Washington, D.C.

(202) 471-3417

(202) 912-4817

Milton is a member of the State Attorneys General Practice and has developed an active antitrust and consumer protection litigation practice. He served with the government for 14 years at the U.S. Department of Justice and the offices of the attorneys general of Virginia and Massachusetts. In private practice, Milton has represented major companies on a wide range of antitrust and consumer protection investigations and litigations involving state attorneys general across the United States, as well as the Federal Trade Commission and U.S. Department of Justice.

Milton has an active antitrust and consumer protection counseling practice, advising companies on related compliance issues. He also regularly advises clients on potential acquisitions from an antitrust perspective. Milton has advised companies through all stages of the Hart-Scott-Rodino premerger notification process, including Harbour Group and Gladstone Corporation.

Milton served as senior counsel to the assistant attorney general for antitrust, U.S. Department of Justice, during the Clinton administration. In this capacity, he advised the assistant attorney general on a wide range of issues, including energy and health care. Milton served as the Antitrust Division’s first liaison to state attorneys general. Prior to his service at the Justice Department, Milton served as an antitrust and consumer protection litigator in the offices of the attorneys general of Massachusetts and Virginia, where he handled litigations and investigations involving many industries, including the soft drink, automobile, retail, agriculture, health care, and waste disposal industries. During his tenure as a state antitrust prosecutor, Milton was a leading member of the Multistate Antitrust Task Force of the National Association of Attorneys General.

Milton is a member of Cozen O'Connor's board of directors. He has served in various leadership positions in the Section of Antitrust Law of the American Bar Association, including chair of the Civil Litigation and Procedure Committee, and vice chair of the Corporate Counseling Committee. He currently serves on the Advisory Board of the American Antitrust Institute. He also is a long-time member of the National Bar Association. 



138 Cozen O’Connor Attorneys Named to the Best Lawyers in America

August 28, 2019

Best Lawyers selected 138 Cozen O’Connor lawyers from 21 of the firm’s national offices for inclusion in the 2020 edition of The Best Lawyers in America.

13 Cozen O'Connor Attorneys Recognized as Washington, D.C. Super Lawyers and Rising Stars

April 25, 2019

The 2019 Washington, D.C, edition of Super Lawyers Magazine, published by Thomson Reuters, has named 13 Cozen O’Connor attorneys to its list of Super Lawyers and Rising Stars.

126 Cozen O’Connor Attorneys Named to the Best Lawyers in America

August 22, 2018

One hundred twenty-six Cozen O’Connor lawyers from 20 of the firm’s national offices have been selected for inclusion in the 2018 edition of The Best Lawyers in America.

Washington, D.C. Super Lawyers Recognizes 15 Cozen O'Connor Attorneys

May 15, 2018

Fourteen Cozen O’Connor attorneys have been named 2018 Super Lawyers or Rising Stars by Super Lawyers Magazine Washington, D.C. edition, published by Thomson Reuters.

Milton Marquis Elected to Case Western Reserve Board of Trustees

June 30, 2015

Milton A. Marquis, a member of Cozen O’Connor’s State Attorneys General Practice, has recently been elected to the Board of Trustees for Case Western Reserve University. Milton focuses his practice on antitrust and consumer protection litigation. As a member of the nation’s leading State Attorneys General Practice, Milton has represented major companies on a wide range of antitrust and consumer protection investigations and litigations and legal and policy matters involving state attorneys gen

Cozen O’Connor Launches New State Attorneys General Practice with Addition of Nationally Acclaimed State AG Practice

May 05, 2015

On the heels of its recent announcement of the addition of 60 lawyers in Chicago, Cozen O’Connor is proud to announce the addition of ten attorneys and government professionals and the formation of the firm’s State Attorneys General Practice.


State Attorneys General Antitrust Enforcement: Trends and Insights

August 26, 2019

Milton Marquis, Ann-Marie Luciano & Keturah Taylor published an article highlighting the growing role of State Attorneys General utilizing their antitrust authority on a national scale through multistate action and co-enforcement activity with their federal counterparts.

FTC and DOJ Issue Guidance on Application of Antitrust Law to Employee Hiring and Compensation [Labor & Employment Alert]

October 25, 2016

The FTC and the DOJ jointly released Antitrust Guidance for Human Resources Professionals, advising that, going forward, the DOJ intends to criminally investigate companies who agree with competitor(s) to fix wages or other terms of employment or enter into so-called “no-poaching” agreements by agreeing not to recruit each other’s employees.

The State AG Report Weekly Update October 29, 2015 [The State AG Report Blog]

October 29, 2015

Consumer Protection FTC Settles with Mobile Service Provider for Alleged Fair Credit Reporting Act Violations The Federal Trade Commission (“FTC”) reached a settlement with Sprint Corporation to resolve allegations it violated the Fair Credit Reporting Act (“FCRA”) and its Risk-Based Pricing Rule,...

The State AG Report Weekly Update October 1, 2015 [The State AG Report Blog]

October 01, 2015

Campaign Finance Washington Attorney General Sues Employee Union and PAC for Alleged Campaign Finance Violations Washington AG Bob Ferguson filed a lawsuit against the Service Employees International Healthcare 775NW (“SEIU 775”) and political action committee SEIU 775 Quality Care Committee...

The State AG Report Weekly Update August 20, 2015 [The State AG Report Blog]

August 20, 2015

Antitrust Alaska Attorney General Denies LNG Acquisition Citing Anticompetitive Concerns Alaska AG Craig Richards rejected the proposed acquisition of a liquefied natural gas (“LNG”) facility in Port MacKenzie by Harvest Alaska, a subsidiary of Hilcorp Energy (“HilCorp”), over concerns that the...

The State AG Report Weekly Update July 2, 2015 [The State AG Report Blog]

July 02, 2015

Antitrust Second Circuit Upholds Ruling Against Apple for E-Book Price Fixing Conspiracy The U.S. Court of Appeals for the Second Circuit upheld a District Court ruling, finding that Apple orchestrated a conspiracy among book publishers to fix prices for e-books. A lawsuit was brought by 33...

The State AG Report Weekly Update May 21, 2015 [The State AG Report Blog]

May 21, 2015

Breaking News FTC, All Fifty States, and DC Sue Four Cancer Charities for Deceptive Practices The Federal Trade Commission and Attorneys General and other law enforcement personnel from all fifty states and the District of Columbia filed a lawsuit against Cancer Fund of America, Inc., Cancer...

2017 Guide to State Attorneys General [Map]

May 05, 2015

The guide includes information on attorney generals in all 50 states, the District of Columbia, Commonwealth, and Territories of the United States, including a photos, year first elected or appointed, political party affiliation, leadership positions and brief background summaries.

Industry Sectors


  • Case Western Reserve University School of Law, J.D., 1984
  • University of Georgia, B.A., 1979

Awards & Honors

Lawyers of Color Power List Honoree 2020

Best Lawyers in America 2019

  • District of Columbia