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Gray , a graduate of Duke University , was a professor at Rollins College until 2011 , when he went to the University of Hartford 's Hartt School At Rollins he taught Meisner Technique Acting for Musical Theatre .
 Gray, Duke University, Rollins College, University of Hartford, Rollins
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Gray, Duke University, Rollins College, University of Hartford, Rollins