Mark provides strategic advice to clients on competition and trade issues related to the structuring of national and global distribution networks, joint ventures, mergers and acquisitions, and intellectual property protection. Mark also serves as first-chair trial counsel for companies and individuals under law enforcement scrutiny or facing bet-the-company litigation.

Mark is ranked in the first band — the top tier — for white-collar crime and government investigation in Louisiana by Chambers USA and Benchmark Litigation, Super Lawyers, The Best Lawyers in America, and New Orleans CityBusiness and serves as primary outside antitrust and compliance counsel for companies in a wide range of industries, including the petrochemical, energy, agriculture, financial services, insurance pharmaceutical, food, healthcare, and entertainment sectors.  

While much of his work for clients is highly confidential, his recent public antitrust engagements include serving as lead trial counsel for the Sun Belt Conference in multi-district antitrust litigation challenging athletic scholarships, for the Sun Belt Conference in multi-district litigation seeking class action treatment for student athlete concussion claims, and for Stewart Enterprises in the merger clearance investigation of the $1.4 billion acquisition by Service Corporation International.