Mark is the former Chair of the Maritime practice group of Woods Rogers Vandeventer Black (WRVB), where he is part of a team of lawyers who concentrate on maritime and transportation law for international, national and local clients and insurers. His federal court trial experience includes major casualties such as collisions, pollution, cargo damage, and serious personal injuries; as well as transactional disputes including charter parties, ship repair contracts, tariffs and towing agreements. He also litigates maritime matters in state court including personal injury defense and commercial matters. Administrative law related to the marine industry such as Coast Guard, Customs, and NOAA/NMFS are also areas in which Mark specializes.

In addition to local clients, Mark represents domestic marine insurers,  as well as the P & I Clubs in the International Group together with their domestic and foreign vessel operators.

In recent matters he has represented a bunker supplier in successfully opposing a petition for certiorari before the U.S. Supreme Court, and obtained a jury verdict in a dispute between the owner of a large custom yacht and the shipyard that performed design modifications. Other recent matters include representation in Coast Guard proceedings of operators of ships that have collided with yachts.  Mark has represented a client in an oil pollution matter in which his team succeeded in obtaining limitation of liability under the Oil Pollution Act of 1990 and sustained the ruling through appeal to the U.S. Supreme Court. Mark and his team have both conducted and defended numerous vessel arrests and attachments in multiple East Coast ports and successfully prosecuted same through the federal appeals courts. On an ongoing basis, Mark is representing vessel operators and terminals in defending personal injury claims in litigation in state and federal courts.

Mark practices in federal and state court as well as before administrative law judges in proceedings of the United States Coast Guard, Customs, and National Marine Fisheries. He handles arbitrations before multiple tribunals. He is admitted to practice in Virginia as well as the United States Court of International Trade, the United States Supreme Court, the Court of Appeals for the Fourth Circuit, the Court of Appeals for the Federal Circuit, and the Eastern and Western Districts of Virginia.