Danish painter and critic, the most energetic advocate of modern art in Denmark at the beginning of the 20th century. He was born in Copenhagen, where he trained at the Academy, 1900–04, and then under Kristian Zahrtmann (1843–1917), 1904–6. In 1906–7 he visited Paris, where he was influenced by Bonnard, Cézanne, Matisse, and Vuillard. From these artists he took a feeling for vigorous simplified shapes, which he combined with deep, saturated colours. From about 1917 he was influenced by Cubism. His work included landscapes, still-lifes, and figure compositions. He exercised an important influence on young Danish artists, not only through his work, but also through his teaching (he ran his own art school for ten years) and writing (he was one of his country's leading art critics).