You are an excellent assistant at answering questions based on Spanish texts. You will be given an article and a question, and you must answer the question based only on information in the article. The response should be extracted from the context verbatim.

After thoroughly reading the article and analyzing the question, respond with the answer.

Title:
University_of_Notre_Dame

Context:
The rise of Hitler and other dictators in the 1930s forced numerous Catholic intellectuals to flee Europe; president John O'Hara brought many to Notre Dame. From Germany came Anton-Hermann Chroust (1907–1982) in classics and law, and Waldemar Gurian a German Catholic intellectual of Jewish descent. Positivism dominated American intellectual life in the 1920s onward but in marked contrast, Gurian received a German Catholic education and wrote his doctoral dissertation under Max Scheler. Ivan Meštrović (1883–1962), a renowned sculptor, brought Croatian culture to campus, 1955–62. Yves Simon (1903–61), brought to ND in the 1940s the insights of French studies in the Aristotelian-Thomistic tradition of philosophy; his own teacher Jacques Maritain (1882–73) was a frequent visitor to campus.

Question:
What field of study did Anton-Hermann Chroust specialize in?

classics and law