They primarily founded the "Feyyaz-Nihat Müşavir Mühendislik" (Feyyaz Niyazi Consulting Engineering), and received governmental and private business [REF].
Presently, Tekfen Construction and Installation Co., Inc., as an affiliate of Tekfen Holding Co., Inc., is an international contractor in Turkey, the Middle East, North Africa, Caucasia & Central Asia, East & Central Europe.