146766
Following two years in seminary college in Chicago , he held postdoctoral positions at Caltech ( Chaim Weizmann Fellow ) , the Hale Observatories , the University of Chicago , and Cambridge University ( NATO Postdoctoral Fellow ) before joining the Department of Physics at the State University of New Jersey .
 Caltech, Hale Observatories, University of Chicago, Cambridge University
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Caltech, Hale Observatories, University of Chicago, Cambridge University