Norman Borlaug was an agricultural scientist recognized as the father of the Green Revolution, the technological transformation of agriculture in the second half of the 20th century. For his work in expanding the world's food supply, in particular creating high-yield varieties of wheat, Borlaug was awarded the Nobel Peace Prize in 1970.
Perhaps this sentence from the WSJ's obituary best sums up the impact of Borlaug's work:
Today, famines—whether in Zimbabwe, Darfur or North Korea—are politically induced events, not true natural disasters.
One can hardly ask for more from a scientist.