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A number of high-profile film directors , including Christopher Nolan , Paul Thomas Anderson , David O. Russell and Quentin Tarantino Steven Spielberg has stated that though digital projection produces a much better image than film if originally shot in digital , it is " inferior " when it has been converted to digital .
 Christopher Nolan, Paul Thomas Anderson, David O. Russell, Quentin Tarantino, Steven Spielberg
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Christopher Nolan, Paul Thomas Anderson, David O. Russell, Quentin Tarantino, Steven Spielberg