Atlas Energy Group, LLC and Atlas Resource Partners, L.P. announced the appointment of Jeffrey M. Slotterback as Chief Financial Officer of both ATLS and ARP, which will take effect as of September 18th. Mr. Slotterback currently serves as Chief Accounting Officer of both Atlas companies, which has been his position since March 2011. In addition, Mr. Slotterback has served in senior financial management positions at Atlas and Atlas predecessor companies since May 2007.

Prior to joining Atlas, Mr. Slotterback was a Senior Auditor at Deloitte and Touche, LLP. Sean McGrath, currently Chief Financial Officer of ATLS and ARP, will be pursuing other business activities outside of the energy industry and will transition his role with Mr. Slotterback over the next several weeks.