He was born to a poor family; what he would later describe as "respectable poverty". His father painted signs and glass and made frames. Although his mother and sisters were members of the
Mennonite church, his father was
anticlerical. Both of his brothers were members of the labor movement. At the age of nine, he developed
tuberculosis in his vertebrae and could not finish school. In 1896, he saw the works of
Van Gogh at an exhibition in Groningen, which had a deep and permanent effect on his style. That same year, thanks to a government grant, he enrolled at the "
Teekenschool voor Kunstambachten" in Amsterdam and, after graduating, became a drawing teacher at a technical school. It was then that his growing interest in socialism led him to join the
Social Democratic Workers' Party (SDAP). One of his first projects as a member involved a study of the housing situation in Amsterdam. The result was a 100-page booklet called "Krotten en Sloppen" (Shacks and Slums), published in 1901, with his drawings. The following year,
Het Volk, a socialist newspaper, held a contest to find an artist for their weekly Sunday supplement. Hahn was selected and signed to a permanent contract. Soon, he began creating political cartoons in addition to illustrations; for
De Notenkraker as well as
Het Volk, and was able to quit his teaching job in 1905. After the beginning of World War I, his works dealt almost exclusively with denouncing the needless death and destruction. Although he had occasional serious relapses, in 1911 he married the recently divorced Iemkje Dijkman, adopted her two sons, and had two daughters. In 1918, just before the end of the war, he succumbed to his disease. Over his career, he produced more than 4,000 drawings. A major retrospective of his work was held at the
Nederlands Persmuseum in 2000. ==Selected posters==