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He completed his doctorate at Harvard in 1947 under the mentorship of Paul D. Bartlett and a postdoc at  UCLA  with  Saul Winstein  in 1948 .
 employee of: UCLA, Saul Winstein
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: cities of residence, top members employees, members, alternate names, origin, state or provinces of residence, title of person, spouse, city of headquarters, NA, founded by, state or province of headquarters, employee of, countries of residence, country of birth, founded, subsidiaries, country of headquarters 
Text: {0} 
 Entity Pairs:  UCLA, Saul Winstein 
Answer:
 employee of: UCLA, Saul Winstein