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After postdoctoral studies at Princeton University with Salomon Bochner , and then the University of Cambridge in England , he began a two-year instructorship at Duke University , where he met his future wife , Mary Layne , also a mathematics instructor at Duke .
 Princeton University, University of Cambridge, Duke University, Mary Layne, Duke
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Princeton University, University of Cambridge, Duke University, Mary Layne, Duke