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After several years working as a member of the Technical Staff at Bell Laboratories ( BTL ) at Murray Hill , NJ , developing an ultrasonic amplifier , a mechanism invented by Dr. D.L. White , Tsu moved to the IBM , T.J. Watson Research Center in Yorktown Heights , NY as an associate to Dr. Leo Esaki beginning a well-known collaboration that yielded a theory of man-made quantum materials , superlattice s and quantum wells .
 organization: Bell Laboratories; person: Tsu; person: Dr. Leo Esaki
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: Bell Laboratories, Tsu, Dr. Leo Esaki 
Answer:
 organization: Bell Laboratories; person: Tsu; person: Dr. Leo Esaki