Mike Haefner joined Atmos Energy in June 2008 as a senior vice president.

Haefner had been founder and president of the consulting firm Perform for Life, LLC. Previously, he had served for 10 years as senior vice president, human resources, at Sabre Holdings Corporation, the parent company of Sabre Airline Solutions, Sabre Travel Network and Travelocity. He also held leadership positions within Sabre from 1991 to 1997 while it was a division of AMR Corporation, the parent of American Airlines.

Earlier, he had worked as an outside management consultant for Xerox Corporation and in computing research at Eastman Kodak Company.

Haefner earned a bachelor's degree in mathematics from St. John Fisher College in Rochester, New York, and his master's degree in computer science from State University.