75599
He earned his Ph.D. from Columbia University , and he did extensive research in Brazil and Madagascar , visiting societies there and writing books about them .
 Columbia University, Brazil, Madagascar
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Columbia University, Brazil, Madagascar