Dallas-based Allegro, a developer of energy trading and risk management software, said late Wednesday that it has appointed Patrich Simpkins to the firm's board of directors. Allegro, which is venture backed by North Bridge Venture Partners and Tudor Ventures, said that Simplins is curently managing partner at banking advisory firm GPS Capital Partners out of Dallas. Simplkins has also served at SensorLogic, TXU Energy, and Duke Energy.