It was Ehrenfest, however, who looked after Kloosterman as he would his own students, making sure that he had the opportunity to study with the experts on the subject of his thesis. Ehrenfest arranged for Kloosterman to spend some time in Copenhagen working with Harald Bohr, Niels Bohr 's brother.
Ito ay Ehrenfest, gayunpaman, na tumingin matapos Kloosterman na siya ay ang kanyang sariling mga mag-aaral, siguraduhin na niya ang pagkakataon sa pag-aaral sa mga eksperto sa paksa ng kanyang sanaysay. Ehrenfest inayos para sa Kloosterman na gumastos ng ilang oras sa Copenhagen nagtatrabaho sa Harald Bohr, Niels Bohr 's kapatid na lalaki.