What Danish physicist did American theoretical physicist work with?
John Archibald Wheeler:  Wheeler also worked with Niels Bohr in explaining the basic principles behind nuclear fission. Niels Bohr: Niels Henrik David Bohr (] ; 7 October 1885 – 18 November 1962) was a Danish physicist who made foundational contributions to understanding atomic structure and quantum theory, for which he received the Nobel Prize in Physics in 1922.
i don't know