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Before accepting the ambassadorship from President Barack Obama , Roos was the CEO of Silicon Valley - based law firm Wilson Sonsini Goodrich & Rosati .
 Barack Obama, Roos, Silicon Valley, Wilson Sonsini Goodrich & Rosati
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Barack Obama, Roos, Silicon Valley, Wilson Sonsini Goodrich & Rosati