LONDON, Sept. 3, 2024 /PRNewswire/ -- Markel, the insurance operations within Markel Group Inc. (NYSE:MKL), today announced the appointment of Rhys O'Neill as Senior Underwriter, Marine & Energy Liability, International Specialty, with immediate effect.Rhys O'Neill, Senior Underwriter - Marine & Energy Liability, International Specialty at MarkelIn his new role, O'Neill will be responsible for enhancing best-in-class underwriting strategies for renewing and new business within Markel's Marine & Energy Liabi ...