Postmaster named Mary Therkelsen will be the new postmaster at the Eastsound main post office, effective Dec. 6, the post office announced this week. November 24, 2008 10:42 pm Mary Therkelsen will be the new postmaster at the Eastsound main post office, effective Dec. 6, the post office announced this week. Therkelsen lives in Anacortes and has been the officer in charge at the Eastsound post office since September.