Derek Reiners is senior vice president and chief accounting officer of ONEOK and ONEOK Partners.

Reiners was a partner at Grant Thornton LLP in Dallas, a certified public accounting firm where he served as the north Texas energy industry practice leader. A certified public accountant, he joined Grant Thornton in 2002 from Arthur Andersen LLP in Tulsa, where he held a variety of roles of increasing responsibility after joining the firm in 1995.

He earned a Bachelor of Science degree in business administration in 1993 from Oklahoma State University in Stillwater, with a double major in finance and economics. He earned a Master of Science degree in accounting from Oklahoma State in 1999.