Arpad Pusztai

Biologist Arpad Pusztai had more than 300 articles and 12 books to his credit and was the world's top expert in his field.

But when he accidentally discovered that genetically modified (GM) foods are dangerous, he became the biotech industry's bad-boy poster child, setting an example for other scientists thinking about blowing the whistle.

In the early 1990s, Dr. Pusztai was awarded a $3 million grant by the UK government to design the system for safety testing genetically modified organisms (GMOs).