1970 - Norman Bourlag
Norman Borlaug, the "father of the Green Revolution", has lived in developing nations for most of the past five decades, teaching the techniques of high-yield agriculture.
The most "unsung" of the American Nobel Laureates, yet known as a hero throughout the developing world, he received the Nobel Peace Prize primarily for his work in reversing the food shortages that haunted India and Pakistan in the 1960s.
Perhaps more than anyone else, Borlaug is responsible for the fact that global food production has expanded faster than the human population, averting the mass starvations that were widely predicted.
The form of agriculture that Borlaug preaches may have prevented a billion deaths. At 93 years old, he still teaches at Texas A & M University.