Professor Yuan（1930.9.7-2021.5.22） is widely acknowledged for the discovery of the genetic basis of heterosis in rice—a phenomenon in which the progeny of two distinctly different parents grow faster, yield more, and resist stress better than either parent. Professor Yuan’s pioneering research has helped transform China from food deficiency to food security within three decades. His accomplishments and clear vision helped create a more abundant food supply and, through food security, a more stable world. Professor Yuan’s distinguished life’s work has caused many to call him the “Father of Hybrid Rice,” while his continuing research offers even more promise for world food security and adequate nutrition for the world’s poor.