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Mary Spears is senior vice president and chief accounting officer, finance and tax. She is responsible for ONEOK's accounting operations and financial reporting functions, from segment accounting through corporate consolidation and reporting, and treasury and tax activities.

Since joining ONEOK in 2008, Spears has held positions of increasing responsibility, including her most recent role as vice president, chief accounting officer.

Before joining the company, she worked at Deloitte & Touche and Latham & Watkins. Spears is a certified public accountant and an FSA (Fundamentals of Sustainability Accounting) credential-holder. She is a member of the American Institute of Certified Public Accountants, the Oklahoma Society of CPAs, and the Accounting Financial Women's Alliance. Active in the community, Spears serves as treasurer of the Foundation for Tulsa Schools.

A native of Helena, Montana, Spears earned a Bachelor of Science degree in accounting in 2001 from Oral Roberts University in Tulsa, Oklahoma.