Greg is chair of the firm’s Antitrust & Competition practice group and a nationally recognized trial lawyer in complex business litigation.

He has won victories for defendants and plaintiffs in some of Maine's largest cases and maintains a national and international litigation practice. He frequently advises overseas clients on U.S. legal matters. He is listed in Woodward/White's The Best Lawyers in America, which named him 2017 and 2015 "Lawyer of the Year" for Mass Tort Litigation/Class Actions - Defendants. He currently serves as court-appointed co-lead counsel for direct purchasers in In re Automotive Parts Antitrust Litigation, a series of private civil actions, with more than $200 million in partial settlements to date, that stem from the largest Department of Justice criminal antitrust investigation in U.S. history.

In other recent cases, he won a $19 million jury verdict as lead trial counsel in Missouri federal court in an international contract dispute, recognized in the National Law Journal as one of Top 100 Verdicts of the year; recovered $32 million for a class of direct purchasers of marine hose in federal antitrust litigation in Miami; and brought an antiterrorism case on behalf of American missionaries murdered in Colombia. He has argued five times before the U.S. Judicial Panel on Multidistrict Litigation.

Greg is experienced in class actions, antitrust & trade regulation, international, securities, construction, corporate, intellectual property, products liability, mass torts, contract, fraud, healthcare, RICO, employment, real estate, land use, technology, lender liability, professional malpractice, personal injury, wrongful death, fidelity & surety, insurance, arbitration and mediation.

Professional Activities

  • Vice Chair, American Bar Association Section of Antitrust Law Global Private Litigation Committee
  • Member, The Florida Bar, Antitrust & Trade Regulation Law Certification Committee

  • Participant, Gubernatorial Trade Mission to South Korea

  • Served as Chairman of The Florida Bar Convention
  • Former Member, Florida Bar Grievance Committee

Honors & Recognition

  • AV Preeminent™ rating by the Martindale-Hubbell® Law Directory
  • Listed in the Woodward/White's The Best Lawyers in America for Commercial Litigation, Litigation - Securities, Mass Tort Litigation / Class Actions - Defendants and Mass Tort Litigation / Class Actions - Plaintiffs
  • Recognized for Commercial Litigation in Chambers USA: America's Leading Lawyers for Business, which stated "Greg Hansel stands out for his prowess in relation to complex business litigation work. One interviewee also heralded him as 'a master of class action litigation.'"
  • Selected as a New England Super Lawyer in Antitrust Litigation, Business Litigation and Class Action/Mass Torts
  • Named a Litigation Star in Benchmark: Litigation, the Guide to America's Leading Litigation Firms and Attorneys
  • Board Certified in Antitrust and Trade Regulation Law by The Florida Bar
  • Board Certified in Business Litigation by The Florida Bar

Civic and Charitable Activities

  • Past Chairman of the Board and current Board Member, ProsperityME
  • Regional Vice-Chair, and Member, Board of Directors, Lawyers' Committee for Civil Rights Under Law, Washington, D.C.
  • Chairman, Annual Giving in Northern New England for the University of Virginia School of Law
  • Member, Harvard Alumni Association Board of Directors
    • Regional Director, Harvard Clubs in Maine, New Hampshire, Vermont, and North/Central Massachusetts
    • Past President, Harvard Clubs in Maine and Tampa Bay (formerly West Coast Florida)
  • Member, Maine International Trade Center
  • Portland Rotary Club
  • Served on Executive Committee, Appalachian Mountain Club, Maine Chapter
  • Former Member, Board of Trustees, Portland Symphony Orchestra
  • Acted as pro bono attorney, Maine Equal Justice Partners
  • President, Cape Elizabeth Mock Trial Boosters

Publications and Presentations

  • "Extreme Litigation: An Interview with Judge Wm. Terrell Hodges, Chairman of the Judicial Panel on Multidistrict Litigation", Maine Bar Journal
  • Speaker, "Private Damages Actions: An International Perspective," ABA Section of Antitrust Law Spring Meeting
  • "Antitrust Class Certification After Hydrogen Peroxide" ABA Section of Antitrust Law Spring Meeting
  • "Dispute Resolution," author of Maine Chapter in international legal guide for corporate counsel, Getting the Deal Through, Law Business Research Ltd.
  • Speaker, "Betting-the-Company, How to Avoid and Survive High Stakes U.S. Litigation," Korea In-House Counsel Forum, program co-sponsored by U.S. Embassy, Seoul
  • Speaker, "Hot Topics in Class Actions," Annual Meeting of Maine State Bar Association
  • "Limiting Shareholder Class Actions: The Private Securities Litigation Reform Act of 1995," The Florida Bar Journal
  • "Strong Suit: A Primer on Class Actions," Mainebiz

Firm Highlights


Preti Flaherty Attorneys Sigmund Schutz and Greg Hansel Lead Suit to Help Students Get Housing and Tuition Refunds for Study Abroad Programs Cancelled by CIEE

In the class-action complaint, Council on International Educational Exchange (CIEE) is cited for breach of contract for failing to refund housing and tuition for cancelled study abroad programs A class-action suit has been filed...


Eighteen Preti Flaherty Attorneys Selected as Chambers USA Leaders in Their Field

Eighteen Preti Flaherty attorneys and five practice groups have been selected for inclusion in the 2020 Chambers USA Guide to America's Leading Lawyers for Business , the highly regarded directory of leading attorneys and...


Federal Indictments Follow Long-Running Antitrust Class Action in Ready-Mix Concrete Industry

Yesterday, the U.S. Department of Justice announced that a federal grand jury in Savannah, Georgia, indicted a ready-mix concrete company and four individuals for fixing prices, rigging bids, and allocating customers and markets in...


48 Preti Flaherty Attorneys Selected by Peers for Inclusion in Best Lawyers in America 2021, Including 4 “Lawyers of the Year”

Forty-eight Preti Flaherty attorneys have been named to Best Lawyers in America 2021, including four recognized on the inaugural “Ones to Watch” list for attorneys earlier in their careers and four “Lawyer of the...

Press Coverage

Portland-Based Education Nonprofit Sued For Study Abroad Refunds

A class-action suit has been filed against CIEE on behalf of thousands of college students who were denied any refund of tuition, room and board, and other fees for Spring 2020 study abroad programs...