Morgan Lewis
Photo of  Sean K. McMahan

practice areas

practice accolades

Labor & Employment

The American Lawyer Magazine's Litigation Department of the Year – Labor and Employment Law Finalist 2004, Winner 2006, Finalist 2008, Finalist 2010, and Finalist 2012

Listed in the highest tier for National Labor and Employment Practice in Chambers USA 2013

Named a top 5 firm for employment in BTI's Litigation Outlook 2014 report

Ranked in the top tier by The Legal 500 for Labor and Employment Litigation, ERISA Litigation, Labor-Management Relations, and Workplace and Employment Counseling (2014)

Ranked, National Tier 1: Employment Law – Management, Labor Law – Management, and Litigation – Labor & Employment by U.S. News and Best Lawyers (2011-2012) 

Ranked #1 for "Most Prestigious" Labor and Employment Practice, Vault 2012 Associate Survey

bar admissions

  • District of Columbia
  • Georgia

Court Admissions

  • U.S. Courts of Appeals for the Second, Sixth, and Eleventh Circuits
  • U.S. District Court for the District of Colorado
  • U.S. District Court for Northern District of Florida
  • U.S. District Courts for Middle and Northern Districts of Georgia
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Sean K. McMahan

Washington, D.C.
1111 Pennsylvania Ave., NW
Washington, DC 20004-2541
United States of America
Phone: +1.202.739.5520
Fax: +1.202.739.3001

Sean K. McMahan is an associate in Morgan Lewis's Labor and Employment Practice. Mr. McMahan's practice focuses on complex employee benefit litigation, with an emphasis on representing corporate clients, plan sponsors, and fiduciaries in ERISA class action litigation.

Mr. McMahan has represented defendants in litigation involving excessive fee and employer stock claims, ESOP litigation, and retiree benefits claims, as well as Title II based defined benefit pension plan claims and individual benefit litigation.

Mr. McMahan has published articles and presented on ERISA litigation topics. He is a member of the American Bar Association, the Southern Employee Benefits Committee, and a contributor to the Fiduciary Responsibility Subcommittee of the Labor and Employment Section of the ABA.

Prior to joining Morgan Lewis, Mr. McMahan was an associate in the Atlanta office of a prominent nationwide firm. Prior to becoming an attorney, Mr. McMahan served approximately ten years in the United States Air Force.

Mr. McMahan earned his J.D. from the University of Virginia School of Law in 2004 and his B.S., cum laude, in computer information systems from Chapman University in 2001.

Mr. McMahan is admitted to practice in the District of Columbia and Georgia and before the U.S. Courts of Appeals for the Second, Sixth, and Eleventh Circuits; the U.S. District Court for the District of Colorado; the U.S. District Court for the Northern District of Florida; and the U.S. District Courts for the Middle and Northern Districts of Georgia.


  • University of Virginia School of Law, 2004, J.D.
  • Chapman University, 2001, B.S., Cum Laude