January 1987 to end 2010, with Chevron, including in engineering and operations, planning and sales; 1998, Director, Sales and Member of the Board; 2008, Managing Director, Marketing; 2010, moved to work in South Africa, at the headquarters of Chevron Africa and the Middle East, as Regional Director for Central and South Africa, until end 2010. January 2011, joined the Egyptian General Petroleum Corporation – EGPC as Vice-Chief Executive for Foreign Trade. August 2011 - February 2012, Vice-Chief Executive for Internal Trade and concurrently, Deputy for Foreign Trade. March - August 2013, Vice-Chief Executive, Operations, EGPC; concurrently also Deputy for Foreign Trade. August 2013 - Sep. 2015, Head, Egyptian General Petroleum Corporation (EGPC). Since Sep. 2015, Minister of Petroleum and Mineral Resources of Egypt.