 In the late 1990s Beaumont began studying the life and music of Zemlinsky, conducting and recording several lesser known pieces (see below), and preparing a completion of Zemlinsky's unfinished opera "Der König Kandaules".In addition, he wrote and published a biography of Zemlinsky in 2000, which has been widely praised.While researching Zemlinsky's affair with Alma Schindler at the library of the American University, Beaumont found her early diaries dating from that period of her life.