Tezrene was the Tholian Ambassador to the United Federation of Planets in the late 24th century.
During the Borg Invasion of 2381, Federation President Nanietta Bacco assembled Ambassadors from all of the local star powers attempting to rally an allied fleet to defend against the Borg Collective. Tezrene arrived late on purpose, dressed in Tholian silk, and demanded Bacco not pull them into their internal conflict. When President Bacco called for a vote, Tezrene opted to not ally with the United Federation of Planets. Bacco later met individually with Ferengi Ambassador Derro in order to convince the Ferengi Alliance to act as an intermediary to hire Breen mercenaries; Tezrene became aware of this and stormed into Bacco's office, and further refused to aid the Federation in any way, and stormed off. (ST - Destiny novel: Mere Mortals)
As of 2382 Tezrene was serving as the Typhon Pact Ambassador to the United Federation of Planets. (TNG - Typhon Pact novel: Paths of Disharmony)