Question: What was the nationality of the man with whom Hans Loewald studied philosophy? 
Sentence (from "Dario Cabanelas"): His scientific contributions are very extensive: he wrote over 100 works, among books, articles, bibliographical reviews and reports, as well as being director of 18 doctorates, 26 master dissertations, etcetera, and lectured on the Arab and Islamic world in Spain and abroad.
Relevant evidence: No