sentences:  In the fall of 1926 he went to the University of Zurich to study and work with Erwin Schrödinger, who had early in the year published his papers on his wave mechanics formulation of quantum mechanics.In early spring of 1927, Dennison went back to Copenhagen, and in late spring he went to the University of Cambridge to work with Ralph Fowler for six weeks – there at the time were Ernest Rutherford, Nevill Francis Mott, Pyotr Kapitsa, Patrick Blackett, and John Cockcroft.The last few weeks of his fellowship were spent at the University of Leiden with Paul Ehrenfest.