Garson "Gar" Tiernan was a male Human native of planet Deneva in the 24th century. He was a politician who, prior to 2381, served as Vice-President under President Cordaro. That year, when Deneva was alerted of an imminent Borg assault, Tiernan joined over 2700 evacuees aboard the freighter SS Libra, in accordance with emergency protocol Plan 2757. After being out of contact with the rest of the Federation for several days, Tiernan learned that Deneva had been destroyed, at that he was the presumed president of what was left of the Denevan government.