John Gellert serves as the President and Chief Executive Officer of SEACOR Marine Holdings Inc., while also maintaining a seat on the corporation's board of directors. Having built an extensive career within the enterprise since the early 1990s, he previously managed international maritime operations across Europe, West Africa, and Southeast Asia before directing the offshore marine services division. Since stepping into the chief executive role, he has guided the company's global fleet modernization, vessel deployment strategies, and operational growth across international energy markets.