Deleum Bhd has appointed former president and chief executive officer (CEO) of Petroliam Nasional Bhd (Petronas), Tan Sri Shamsul Azhar Abbas, as its chairman effective June 1. Shamsul Azhar would succeed Datuk Izham Mahmud, who would remain in the company as a director. Shamsul Azhar joined the board on June 9, 2022 and has had an illustrious career in the oil and gas industry for more than 40 years, serving on various boards of public listed companies. Shamsul Azhar served as president and CEO of Petronas from 2010 to 2015.