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As a photographer who ’s obsessed with a vacuumesque conception of landscape , he has regularly working with Stephen O'Malley from Sunn O ) ) ) ) and the label Southern Lord .
 Stephen O'Malley
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Stephen O'Malley