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Leif Green is an American actor and production manager known for portraying Davey Jaworski one of the T-Bird 's in the 1982 Sequel to the 1978 motion picture Grease Career From the years of 1982 - 1986 he was an actor within that time he appeared in two motion picture ( both of which he played a main character and one of which he sang ) .
 Leif Green, American
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
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Answer:
 Leif Green, American