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He is Head Emeritus of the Space Department Applied Physics Laboratory at Johns Hopkins University Laurel , Maryland , USA and he is a member of Academy of Athens , Greece , where he has the Chair of Science of Space .
 Johns Hopkins University Laurel , Maryland, USA, Greece
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Johns Hopkins University Laurel , Maryland, USA, Greece