Covanta Holding Corporation announced the additions of Danielle Pletka and Michael W. Ranger to its Board of Directors. Ms. Pletka is senior vice president of foreign and defense policy studies at the American Enterprise Institute. Prior to joining AEI, she served as a longtime senior staff member for the United States Senate Committee on Foreign Relations. Mr. Ranger is co-founder and senior managing director of Diamond Castle Holdings, LLC. He has more than 30 years of experience in the energy and power sector.