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He earned his PhD from the University of Wisconsin in 1955 , and has taught at Indiana University ( 1955 – 1957 ) , the University of Pennsylvania ( 1957 – 1961 ) , Purdue University ( 1961 – 1964 ) , Harvard University ( 1967 – 1969 ) , the University of Wisconsin ( 1969 – 1974 ) and Stanford University ( 1974 – ) , where he is the Fairleigh S. Dickinson , Jr. .
 University of Wisconsin, Indiana University, University of Pennsylvania, Purdue University, Harvard University, Wisconsin, Stanford University
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 University of Wisconsin, Indiana University, University of Pennsylvania, Purdue University, Harvard University, Wisconsin, Stanford University