John J. Christmann, IV, 49, was appointed chief executive officer and president effective Jan. 20, 2015, and joined the company's board of directors on Jan. 20, 2015. He previously served as executive vice president and chief operating officer – North America, since January 2014, region vice president – Permian Region from 2010 through 2013, vice president – Business Development, since January 2004, and production manager for the Gulf Coast Region since April 2003. Prior to that, Christmann held various positions of increasing responsibility in the business development area since joining the company in 1997.
Previously, he was employed by Vastar Resources/ARCO Oil and Gas Company in business development, crude oil marketing and engineering assignments.
Christmann is a member of the Texas Tech University Petroleum Engineering Academy. He received his bachelor’s degree in petroleum engineering from the Colorado School of Mines and MBA from Southern Methodist University.
The company's proved reserves at year-end 2010 totaled 2.95 billion barrels of oil equivalent, roughly half oil and half natural gas.