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Diane Sisemore has a work experience in the field of banking and marketing. Diane worked at City Bank & Trust, OKC as an AVP from November 1981 to March 1996. Later, they joined BancFirst as a Senior Vice President of Marketing in March 1996 and their tenure is ongoing.

Diane Sisemore has a Bachelor of Business Administration (BBA) degree in Marketing from the College of Business.