US-based Constellation Energy has announced that Kathleen W Hyle, currently senior vice president, Constellation Energy, will assume the role of chief operating officer of the company’s overall commercial business and lead its new management team. Ms Hyle’s appointment is effective immediately and she will report directly to Mayo A. Shattuck III, chairman, president and chief executive officer. Ms Hyle joined Constellation Energy in 2003. Most recently, she served as senior vice president of finance and chief financial officer for Constellation Energy Nuclear Group and chief financial officer of UniStar Nuclear Energy LLC, a strategic joint venture between Constellation Energy and EDF. Previously, Ms Hyle held senior-level finance positions with Constellation Energy where she oversaw accounting, treasury, tax and financial planning and analysis. This announcement coincides with the resignations, effective immediately, of Thomas V Brooks, president of Constellation Energy Resources and executive vice president, Constellation Energy, and George E Persky, senior vice president, Constellation Energy and chief commercial officer for Constellation Energy Resources.