Dr. P.N. Singh is currently Chairman of Grid Consultants Pvt. Ltd. based in Mumbai. He was earlier Group Director (HRD) of Duncan Goenka Group and a member of the board of directors of two limited companies viz. Stone India Ltd. and Andhra Cement Ltd. He started his career with Indian Oil Corporation in 1963. In 1981, he moved to Voltas Ltd. to head its HRD department. Later he headed Group HRD set-ups in Aditya Birla Group and Mehta Group.