20091
He studied composition as a pupil of Hans Koessler ( a cousin of Max Reger and a great admirer of Johannes Brahms ) , and piano with István Thomán .
 Hans Koessler, Max Reger, Johannes Brahms, István Thomán
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Hans Koessler, Max Reger, Johannes Brahms, István Thomán