Keld Helmer-Petersen is one of the most influential Danish photographers of the 20th Century. He was an international pioneer in colour photography and was a central figure in not only Danish but also European modernist photography. His career spanned 70 years and he had strong interest in modern architecture, industrial areas and structures. He was very prolific and continuously experimented and challenged the many possibilities of the photographic image. His efforts have put a mark on photography as an artistic expression.