De Hevesy placed the resulting solution on a shelf in his laboratory at the Niels Bohr Institute.
He moved to Institute for Theoretical Physics (later the Niels Bohr Institute) in Copenhagen on the Sheldon Traveling Fellowship from Harvard, and remained in Denmark, becoming a professor at the newly formed Nordic Institute for Theoretical Physics (Nordita) in 1957.
From 1959 to 1969, he was employed at Regnecentralen, the Danish computing institute, while at the same time giving lectures at the Niels Bohr Institute and the Technical University of Denmark.
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He was also a Visiting Professor at the University of Paris, the École Normale Supérieure, in Paris, France, the Niels Bohr Institute in Copenhagen, Denmark, and the European School of Business, INSEAD in France.
Among special Danish competences is simulation of neutron scattering, since DTU Physics in Lyngby is the home of the McStas software collaboration (formerly Risø DTU), also comprising the Niels Bohr Institute in Copenhagen Institut Laue-Langevin in Grenoble, France and Paul Scherrer Institute in Villigen, Switzerland