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Levin and Lipton were forced to sell their shares to Robert Schmertz that May for $ 3.95 Million with an option for the two to repurchase half of the Celtics ' stock .
 person: Levin; person: Robert Schmertz; organization: Celtics
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Levin; person: Robert Schmertz; organization: Celtics