After taking a diploma in engineering and geology from the Swiss Federal Institute of Technology in Zurich, he took a doctorate in the geology of the Welsh mountains and then became a research assistant at the Zurich Geological Institute. Hagen first visited Nepal in 1950 with a first Swiss development assistance mission. In 1952 he was employed by the government of Nepal and also worked for the United Nations. He explored the geography of that Himalayan state.
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