Rilwanu Lukman
Rilwanu Lukman (26 August 1938 – 21 July 2014) was an engineer and geologist who held several important positions in Nigeria and other parts of the world. He was the Secretary General of OPEC (Organization of the Petroleum Exporting Countries) from 1 January 1995 to 31 December 2000. He was also Minister of Petroleum Resources under Nigerian presidentUmaru Yar'Adua, holding office until March 2010.