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There is a long series of Nobel Laureates who have been associated with the Niels Bohr Institute (known as the University Institute of Theoretical Physics until 1965) in one way or another. Some have had permanent employment here and there are also many who have worked at the institute for a time as short-term visitors without being a member of staff. The latter have held scholarships or grants and used their stay to collaborate with researchers at the Niels Bohr Institute, most often with a scientific paper as a result.
In addition it has been the custom for many years to invite the physics Nobel Laureates to come to Copenhagen to give a talk and stay for a while at the Institute immediately after receiving the Nobel Prize (now that they were in Stockholm anyway).