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Theodor Joseph Hagen was a German painter and art teacher.
He was one of the founders of German Impressionism. After trying out several styles during his early years, he became attracted to the plein-air painting of the French Barbizon School.
From 1893, he was a member of the Munich Secession and, from 1902, the Berlin Secession.
Carl Ludwig Christoph Douzette, known as Louis Douzette, was a German landscape painter.
Bruno Goller was a German painter. He received his painting training from the Düsseldorf landscape painter Julius Jungheim. Bruno Goller belonged to the artists' community "Das junge Rheinland", which he joined as early as 1920. In 1928 he participated in the founding of the "Rheinische Sezession".
Friedrich Kallmorgen was a German Impressionist painter who specialized in landscapes and cityscapes.