0001033427-10-000017 SC 13G 2 20100128 20100128 DAVID L. COHEN HAROLD J. LEVY ATLAS ENERGY, INC. 0001279228 4922 510404430 DE 1231 SC 13G 34 005-80454 10552838 WESTPOINTE CORPORATE CENTER ONE 1550 CORAOPOLIS HEIGHTS RD. 2ND. FLOOR MOONTOWNSHIP PA 15108 412-262-2830 WESTPOINTE CORPORATE CENTER ONE 1550 CORAOPOLIS HEIGHTS RD. 2ND. FLOOR MOONTOWNSHIP PA 15108 ATLAS AMERICA INC 20040209 IRIDIAN ASSET MANAGEMENT LLC/CT 0001033427 061439577 DE 1231 SC 13G 276 POST RD WEST WESTPORT CT 06880-4704 2033417800 276 POST ROAD WEST WESTPORT CT 06880-4704 SC 13G 1 atlas13ga4123109.htm ATLAS ENERGY 13G/A 12-31-09 EX-99 2 atlasex99.htm JOINT FILING AGREEMENT