KUALA LUMPUR: Former chief justice Tun Arifin Zakaria has been appointed as group chairman of Permodalan Nasional Bhd (PNB) effective from May 6. Arifin has also been named trustee of PNB’s parent Yayasan Pelaburan Bumiputra (YBP) effective the same date. His appointment was announced following Tan Sri Dr Zeti Akhtar Aziz’s retirement as group chairman…