Doudna recalls one aspect of her father’s personality that used to upset her. Martin Doudna tended to categorize people as good or bad, with little respect for the shadings that most people contain. “He had people that he revered and thought were wonderful and they could do no wrong, and then he had people who were horrible and he disagreed with them on everything, and they could do no right.” Reacting to that, Doudna worked hard to see people in all of their complexity. “I felt like the world is kind of grayscale. There are people who have great qualities, but they also have flaws.”