Katherine Vessels obtained her Bachelor of Arts, majoring in chemistry, from Xavier University, Cincinnati, Ohio. She earned her juris doctor with a focus in international law from the University of Hawaii, William S. Richardson School of Law. She was admitted to the Hawaii State Bar in November 2016. Before joining the firm, she served as a Transportation Officer in the U.S. Army, a captain on numerous private vessels in Hawaii, and a research assistant at the Handa and ASEAN Law and Integration Centers. She specialises in maritime security law.