On January 5, 2017, Parsley Energy, Inc. announced that Matthew Gallagher, formerly Vice President-Chief Operating Officer, has been promoted to President and Chief Operating Officer. The appointment was made effective January 5, 2017. Bryan Sheffield, who previously held the title of Chairman, President and Chief Executive Officer, will continue to serve as Chairman and Chief Executive Officer. Matthew Gallagher joined the company in September 2010. Since joining the Company, Mr. Gallagher has overseen the company's engineering and geoscience functions in positions of increasing responsibility, including Vice President-Engineering and Geoscience from 2013 to 2014 and Vice President-Chief Operating Officer since 2014. Prior to joining the company, Mr. Gallagher served as Investor Relations Supervisor for Pioneer Natural Resources (Pioneer) from 2008 to 2010. From 2005 to 2008, Mr. Gallagher held a variety of engineering roles with Pioneer, including Gulf of Mexico Shelf Reservoir Engineer, Hugoton Reservoir Engineer and Spraberry Production and Operations Engineer.