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Origins Prospector , explorer and eventual filmmaker , Robert J. Flaherty , is considered to be the forefather of ethnographic film .
 person: Robert J. Flaherty
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:
 person: Robert J. Flaherty