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In 1838 , Walker was appointed Harvard 's Alford Professor of Natural Religion , Moral Philosophy , and Civil Polity , which position he held until 1853 , when he was elected president of the college .
 Walker, Harvard
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Walker, Harvard