With four offices spanning Texas and Louisiana, and a team of 2,100 “associates,” Baton Rouge-based ISC Constructors LLC is bringing its collaborative approach to electrical and instrumentation work to more customers across the region. The firm saw one of its strongest years in 2014, bolstered by the continued strength of oil and gas-related work in both states that brought a steady project load from clients such as ExxonMobil, Sasol and Shell Oil Co.