Liebermann was educated at the Academy of Fine Arts in Munich. During the Third Reich he received numerous state commissions and served as artistic adviser to the city council of Munich. He sculpted numerous portrait busts of Hitler, including one for the Munich Rathaus. At the "Great German Art Exhibitions" (Große Deutsche Kunstausstellungen) in the Haus der Kunst he exhibited a total of 16 works. He also completed a bronze bust of Hitler's niece Geli Raubal, from which Hitler had numerous copies made for display in his residences.