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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 .
 organization: Princeton University; organization: University of Cambridge; organization: Duke University; person: Mary Layne; organization: Duke
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Princeton University, University of Cambridge, Duke University, Mary Layne, Duke 
Answer:
 organization: Princeton University; organization: University of Cambridge; organization: Duke University; person: Mary Layne; organization: Duke