The appointment is effective immediately. Cohn & Wolfe will join an agency roster that includes Goodby, Silverstein & Partners, creative agency of record; Zenith Optimedia, media agency of record; and Sullivan Higdon & Sink, below-the-line agency of record. Joanne Davis Consulting assisted in the review.About SONIC, America’s Drive-In SONIC, America's Drive-In, originally started as a hamburger and root beer stand in 1953 in Shawnee, Okla., called Top Hat Drive-In, and then changed its name to Sonic in 1959. The first drive-in to adopt the Sonic name is still serving customers in Stillwater, Okla. Sonic has more than 3,500 drive-ins coast to coast, where approximately three million customers eat every day. For more information about Sonic Corp. and its subsidiaries, visit Sonic at www.sonicdrivein.com. Connect with SONIC at facebook.com/sonicdrivein or on Twitter @sonicdrive_in.