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Rufer was a pupil of Alexander von Zemlinsky and Schoenberg in Vienna ; when the latter composer moved to Berlin to direct the Masterclass in Composition at the Prussian Academy of Arts , Rufer went with him and operated as his Chief Assistant between 1925 and 1933 .
 Rufer, Alexander von Zemlinsky, Schoenberg, Vienna, Rufer
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Rufer, Alexander von Zemlinsky, Schoenberg, Vienna, Rufer