Sergius Pauser was born on the 28th of December 1896 in Vienna. He studied at the Academy of Fine Arts in Munich under Carl Johann Becker Gundahl, Ludwig von Herterich, Max Doerner, and Carl Caspar. After that he attended the Academy of Fine Arts in Vienna under Karl Sterrer. He became a member of the Vienna Secession. After a period under which Austrian Expressionism influenced him, Pauser became an important representative of the New Objectivity, which he however later distanced himself from again.
He participated at numerous exhibitions in Germany, Switzerland, and the United States. He directed the master classes for painting at the Vienna Academy of Fine Arts. Pauser became the preferred portraitist of Austrian personalities and distinguished himself as a teacher of many important artists. He received the Grand Austrian State Prize. Sergius Pauser died on March 16, 1970 in Klosterneuburg.