250858
In 2009 , Christakis and his wife , Erika Christakis , were appointed Co-Masters of Pforzheimer House , one of Harvard 's twelve residential houses .
 Christakis, Christakis, Harvard
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Christakis, Christakis, Harvard