Jos Klijnen collaborated with Marinus Granpré Molière and they had great influence on Dutch urban building. They both belonged to the Rotterdam functionalists. Klijnen is generally regarded as a pioneer of the Organic City and a representative of the Rotterdam avant-garde in the 1920s. The apex of his experiments with an expressionistic formal idiom and organic floor plans came with the design he submitted to the 1927 competition for the League of Nations headquarters. His work is unique in that it combined authentic and regional elements with impulses from the national and international avant-garde.