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David Helene Tate ( born 1952 , Washington , D.C. ) served as President/CEO of Rantel Research , Inc. of Laurel , MD , a broadcast radio audience marketing company , from 1979-1997 .
 Tate, Washington , D.C., Rantel, Laurel , MD
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Tate, Washington , D.C., Rantel, Laurel , MD