Mark is an active arbitrator in the field of employment disputes and labor relations. He is a member of the National Academy of Arbitrators and serves on the labor arbitration panels for the American Arbitration Association, the Federal Mediation and Conciliation Service, and the American Health Law Association. Additionally, Mark serves on several permanent arbitration panels under individual collective bargaining agreements in the public and private sectors. In the federal sector, Mark serves as an administrative judge under contract with the U.S. Equal Employment Opportunity Commission.
Mark has mediated hundreds of cases involving employment disputes, labor relations, and civil rights. In addition to private litigated cases, Mark serves on the mediation panels for the American Arbitration Association, the U.S. Equal Employment Opportunity Commission, and the Nuclear Regulatory Commission. He is also listed on the mediation panels for all federal district courts in Tennessee as well as the Tennessee Supreme Court and the Kentucky Court of Justice. In the federal sector, Mark works under contract with several federal agencies to provide mediation services within the federal government.