Tristan da Cunha shares a Governor with St Helena and Ascension Island. The Governor is resident in Jamestown, St Helena, and their official title is Governor of St Helena. Governors try to visit Tristan at least once during their term of office, but day to day administration of Tristan is done by the island's resident Administrator.
A list of current and past Governors is available on Wikipedia, This page contains news relating the appointment of Governors and their dealings with Tristan da Cunha.
