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He taught at Middlebury College , Vermont for two years before joining the music department of Williams College in Williamstown , Massachusetts ( where Stephen Sondheim was one of his students ) .
 organization: Middlebury College; location: Vermont; organization: Williams College; location: Williamstown; location: Massachusetts; person: Stephen Sondheim
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: Middlebury College, Vermont, Williams College, Williamstown, Massachusetts, Stephen Sondheim 
Answer:
 organization: Middlebury College; location: Vermont; organization: Williams College; location: Williamstown; location: Massachusetts; person: Stephen Sondheim