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After graduating from Columbia , Willes became a professor at the Wharton School of Business and a researcher with the Philadelphia Branch of the Federal Reserve Bank .
 Columbia, Willes, Wharton School of Business
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Columbia, Willes, Wharton School of Business