Rosetta Resources Inc., Houston, (Nasdaq: ROSE) has named Randy L. Limbacher president and chief executive. He was president, E&P Americas, for ConocoPhillips, Houston (NYSE: COP). Prior to the acquisition by ConocoPhillips in 2006, he was executive vice president and chief operating officer for Burlington Resources. Limbacher replaces former chairman, CEO and president Bill Berligen, who resigned in July and is now on the board of Contango Oil & Gas Co., Houston (Amex: MCF). Charles Chambers was acting CEO and will resume his previous position as executive vice president, corporate development.