Conversation so far:
When did Parsons attend Heidelberg?
Parsons went on to the University of Heidelberg, where he received his Ph.D.
in sociology and economics in 1927.
What was his best work?
Parsons read extensively in religious literature, especially works focusing on the sociology of religion.
Why was sociology of religion so important?
One scholar who became especially important for Parsons was Ernst D.
Troeltsch (1865-1923).
Parsons also read widely on Calvinism.
Why did he concentrate so much on religious literature?
Parsons read extensively in religious literature.

Question: Who were some of his preferred teachers in religious literature?
Self-contained rewrite: Who were some of Parsons preferred teachers in religious literature?