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Furthermore he has several engagements in German and international research networks , he also heads the PhD program of the Hertie School of Governance in Berlin .
 Hertie School of Governance, Berlin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Hertie School of Governance, Berlin