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Graduating from Yale as a member of the class of 1910 , Riggs embarked on graduate studies at Harvard University as an assistant to Barrett Wendell , which were interrupted by his foray into musical theatre .
 Yale, Riggs, Barrett Wendell
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Yale, Riggs, Barrett Wendell