The Swiss geologist John Haller witnessed the development of Danish polar research within the framework of the expeditions of 1949-1958. Later on, he Compiled the scientific results of the Danish East Greenland Expeditions 1929-1958 as their chief scientist. His early death in 1984 left an immense archive of scientific and personal documents relating to the geological exploration of East and Northeast Greenland. Those documents serve as a base for a review in the field … mehrof earth science history in the tradition of reports on discoveries in the Arctic realm. We have connected this retrospection with the biography of John Haller, researcher, teacher and person. It will show us a man who, working in many capacities, has devoted his scientific opus to one goal: to understand and describe the geological structure and the structural development of the East and Northeast Greenland mountain ranges, both in their local and their larger significance. weniger