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He later served as a football coach at the University of Minnesota ( 1930 – 1931 ) , Princeton University ( 1932 – 1942 ) , and Columbia University ( 1944 – 1945 ) , and as an athletic director at the University of Maine ( 1946 – 1951 ) and University of Denver ( 1951 – 1962 ) .
 University of Minnesota, Princeton University, Columbia University, University of Maine, University of Denver
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 University of Minnesota, Princeton University, Columbia University, University of Maine, University of Denver