He is also an adjunct professor with the U.S. Merchant Marine Academy and offers a graduate level course in Maritime Industry Policy. A former merchant mariner, he sailed and worked ashore for the U.S. Navy’s Military Sealift Command. He recently published Fourth Arm of Defense: Sealift and Maritime Logistics in the Vietnam War, available for free download through the Naval History and Heritage Command at: https://www.history.navy.mil/research/publications/publications-by-subject/Fourth-Arm-of-Defense.html.