111787
The Lenbachhaus was expanded 1927-1929 by Hans Grässel and again 1969-1972 by Heinrich Volbehr and Rudolf Thönessen .
 Hans Grässel, Rudolf
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 Grässel, Rudolf