Steve Letbetter has resigned as chairman and chief executive (CEO) of Houston-based Reliant Resources, an energy services and electricity provider and subsidiary of Reliant Energy. Joel Staff, a member of the board, takes over as interim chairman and CEO. The company has hired search firm Spencer Stuart to look for a permanent CEO. Letbetter (pictured) says: “Now, with the company’s refinancing completed, and after three years at Reliant Resources and many years at predecessor companies, I'm