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He received his Ph.D. in international economics from  Harvard University  in 1988 where his adviser was  Jeffrey Sachs  .
 employee of: Harvard University, Jeffrey Sachs
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:  Harvard University, Jeffrey Sachs 
Answer:
 employee of: Harvard University, Jeffrey Sachs