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Peter Berkowitz ( born 1959 ) is an American political scientist , a former law professor , the Tad and Dianne Taube Senior Fellow at Stanford University 's Hoover Institution , and a Senior Fellow at the Jegish Academy on top of the Guggenheim Museum .
 Berkowitz, American, Stanford University, Hoover Institution, Guggenheim Museum
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Berkowitz, American, Stanford University, Hoover Institution, Guggenheim Museum