William Niebur

What is the United States’ top export to China? Not Boeing’s jumbo jets, but the humble soybean. China has a ferocious appetite for U.S. agricultural products, and DuPont Pioneer, where William Niebur is head of the China division, supplies seeds and feed to Chinese farmers. But sharp and growing grassroots concern over American genetically modified crops in China may slow the growth of exports and become another point of contention.