Morristown-based Covanta Energy announced today it has appointed Bradford J. Helgeson executive vice president and chief financial officer, effective immediately.<br /><br />According to the announcement, Helgeson has been Covanta's vice president and treasurer since 2007, and previously held senior financial positions at Waste Services Inc., a publicly-traded environmental services company with operations in the U.S. and Canada, and worked in investment banking with Lehman Brothers and Donaldson, Lufkin & Jenrette.<br /><br />Helgeson will replace Sanjiv Khattri, who will be actively assisting in the transition "prior to moving on to his next endeavor," chief executive Anthony Orlando said in a statement.