System One, a Pittsburgh-based staffing firm, announced this week that it had acquired another staffing firm with offices in Oklahoma and Texas. The acquired firm, the Rowland Group, will become a System One division and continue to operate under its current brand. With the acquisition, System One will enter the Tulsa, Oklahoma market for the first time, as well as strengthen its presence in Houston. The Rowland Group was founded more than 25 years ago and specializes in staffing for the energy,...