Jim has extensive experience helping businesses and trade associations achieve their strategic objectives. Prior to joining Jones Walker, Jim was president and CEO of the Offshore Marine Service Association (OMSA), representing the owners and operators of US-flagged vessels that supply, support, and construct the subsea infrastructure necessary for offshore energy development. Under his leadership, the trade association confronted the challenges posed by the moratorium on drilling activity imposed following the Deepwater Horizon disaster.

Before his tenure at OMSA, Jim was vice president of government affairs for American Commercial Lines, Inc. (ACL), where he advanced ACL's legislative and regulatory affairs programs to improve the nation's waterways transportation infrastructure. He also worked to implement positive changes on inland waterway tax policy and the US Coast Guard's regulation of the inland barge industry.

Jim also has experience in railroads and highway infrastructure development. As resident vice president for CSX Transportation, he represented CSX in government and community forums in Kentucky. In the public sector, Jim served in senior leadership positions in Kentucky's Transportation Cabinet and Kentucky's Department of Public Protection.

Jim began his career as a commissioned Coast Guard officer. At sea, he served as a deck watch officer and department head with responsibilities for vessel operations, navigation, and maritime law enforcement. Later he was named congressional fellow to the Coast Guard and Navigation Subcommittee in the House of Representatives. Following his Coast Guard service, Jim joined the subcommittee's professional staff, advancing legislation supporting the US Coast Guard and improving the safety and efficiency of regulatory programs affecting the offshore maritime industry, fishing industry, and inland barge industry.

Marc represents businesses and trade groups before US federal and state agencies, the US Congress, and foreign governments on a broad range of regulatory, administrative, and legislative matters. He also represents clients in maritime and commercial litigation and arbitration matters. Marc has published numerous articles on international trade, maritime, and environmental law, and has written and spoken at dozens of seminars and conferences focused on these topics.

Throughout his career, Marc has been active and held leadership roles in a variety of professional associations, including serving as chair of the Greater New Orleans Port Safety Council (2011, 2016, 2017, and 2018) and co-moderator and member of the Seminar Steering Committee for the Greater New Orleans Barge Fleeting Association, River and Marine Industry Seminar (2013 to present). In 2008, he was appointed by US Commerce Secretary Carlos Gutierrez and the United States Trade Representative (USTR) Ambassador Susan Schwab to serve on the Industry Trade Advisory Committee 14, where he served until 2010.

Marc practiced law with Bracewell & Patterson in Washington, DC, from 1996 to 2002. Before that, he worked for the US House of Representatives Government Reform and Oversight Subcommittee on National Economic Growth, Natural Resources, and Regulatory Affairs. From 2002 to 2005, he was an adjunct professor at the Loyola University New Orleans College of Law.