Mark M. Trapp is a partner in Conn Maciel Carey’s Chicago office. He practices law with a concentration in labor and employment.  


Mr. Trapp defends employers in a broad range of NLRB litigation and arbitration proceedings, and provides counsel on issues involving the National Labor Relations Act. He offers guidance on union election campaigns and labor relations, and has negotiated numerous collective bargaining agreements. Mr. Trapp also handles matters arising under the ADA, ADEA, and Title VII federal anti-discrimination laws. 


Mr. Trapp’s experience with multiemployer pension withdrawal liability has been recognized across the country and has prompted numerous speaking engagements for professional organizations and businesses.  His articles on withdrawal liability and other labor and employment issues have been published in a variety of respected publications. The scope of his service encompasses issues beyond general labor and employment law including litigation, trade secrets, and non-competes. He has briefed and argued numerous appeals before federal and state appellate courts.




Mark M. Trapp quoted in "2nd Circ. Pension Calculation Fight Has High Stakes For Cos."

Mark M. Trapp recommended in the Labor-Management Relations category by The Legal 500 United States (2014 – 2017)




Washington and Lee University, J.D., 2000

University of Illinois, A.B., 1996





District of Columbia

South Carolina

North Carolina



U.S. Court of Appeals for the District of Columbia Circuit

U.S. Court of Appeals for the Fourth Circuit

U.S. Court of Appeals for the Seventh Circuit

U.S. Court of Appeals for the Ninth Circuit

U.S. District Court, District of Maryland

U.S. District Court, District of South Carolina

U.S. District Court, Eastern District of North Carolina

U.S. District Court, Middle District of North Carolina

U.S. District Court, Northern District of Illinois

U.S. District Court, Western District of North Carolina
(O) 312.809.8122
(M) 202.302.7841
Mark M. Trapp
Partner, Labor • Employment Practice Group


53 West Jackson Boulevard • Suite 1328
Chicago IL 60604
5335 Wisconsin Ave NW • Suite 660
Washington DC 20015