Matthew Simmons, born on April 7, 1943, was an esteemed energy analyst and author from the United States. He had over 30 years of experience in the oil and energy sectors and served as a consultant for several energy companies. Simmons was renowned for his profound insights into the global energy market, and he authored 'Twilight in the Desert: The Coming Saudi Oil Shock and the World Economy', which detailed his predictions about peak oil.