OKLAHOMA CITY--(BUSINESS WIRE)--Sonic Corp. (NASDAQ:SONC), the nation's largest chain of drive-in restaurants, today announced the appointment of Susan E. Thronson to its Board of Directors for a term ending at the next annual meeting of shareholders in 2016. Ms. Thronson served as Senior Vice President, Global Marketing, at Marriott International, Inc., from July 2005 to July 2013. During her 24-year tenure with Marriott, she held a variety of progressive marketing management positions, includ
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