7014
Director of the Yerkes Observatory for many years , while there he designed and built a rotatable telescope for polarization studies and developed photometric instrumentation .
 organization: Yerkes Observatory
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 organization: Yerkes Observatory