Melanie M. Trenthas been promoted to executive vice president, general counsel and chief administrative officer Rowan Cos. She will assume responsibility for the legal function as well as retain responsibility for the human resources, information technology and communications departments. [...] Joe Raab, formerly the global field crops breeding lead atAdvanta, has joined RiceTec as president of research technology solutions. Esquire Deposition Solutions announced the addition of Joan Hauser as Houston-area sales manager and Marissa Fuqua as a regional litigation consultant for the Houston area. Powell will provide guidance on employee benefits, human resources, employment law, and merger and acquisition issues. Nehl Horton has joined Sysco Corp.