The painter and graphic artist Karl Markus primarily created landscapes with strong colours, initially inspired by Josef Dobrowsky, and after 1945 in a more objective style of painting. Markus, who had lived in Vienna since 1910, worked full-time as a bank clerk. From the early 1930s he was a private student of Karl Gunsam, otherwise self-taught. Belonged to the circle of friends around Gunsam, H. Steiner, Herbert Potuznik, Ernst Paar and H. Letz. In 1937/1938, Markus was a member of the Hagenbund, and from 1945 of the Vienna Secession; He served as treasurer of the Secession until 1973. He was also a member of the Marchfeld Künstlervereinigung. Study trips took him to Italy, the Balcans, Greece, Turkey and England. In 1964, Markus took part in a collective in the Vienna Secession. Further exhibition participations e.g. B. in Nuremberg, Oslo, Bucharest, Rome, London, New York and Johannesburg. His works include: in the Albertina and in the Museum of the City of Vienna/Vienna Museum. Honors, prizes: 1965 Josef Hoffmann Honor from the Vienna Secession; 1969 Awarded the title of professor.