Matthew R. Simmons

Matthew R. Simmons was Chairman and President of Simmons & Company International, a Houston-based investment bank specialising in the energy sector, and an advocate of the peak oil theory. He was the author of "Twilight in the Desert," which questioned the scale of Saudi Arabia's oil reserves, and testified before the U.S. Congress on energy issues. He died in 2010.

He spoke as a panellist at Mare Forum USA 2004 and chaired a session at Mare Forum Houston 2002.