Mr. Barkmann has served as Senior Vice President of Reservoir Engineering since November 2021. Prior to his current position with us, he served as our Vice President of Reservoir Engineering from February 2019 to November 2021 and as Reservoir Engineering Manager since joining us in November 2018. Before joining Diamondback, Mr. Barkmann worked for Energen Resources Corporation from May 2006 to November 2018 serving in various capacities of increasing responsibility, most recently as Reservoir Engineering Manager and has worked in the Permian Basin since 2006. Mr. Barkmann began his career with BJ Services in June 2004 as a Completions Engineer, joining Energen Resources Corporation in May 2006 as a Reservoir Engineer. He then moved to the Business Development group as an Acquisitions Engineer in September 2010 building substantial acreage positions in the Midland and Delaware Basins. Mr. Barkmann was promoted to Reservoir Engineering Supervisor of the Midland Basin in January 2014 where he coordinated all aspects of Reservoir Engineering for Energen at the onset of its horizontal shale development program. Mr. Barkmann graduated from Louisiana State University with a Bachelor of Science in Petroleum.