The research made Harlow famous (and infamous, too revulsion at his work helped spur the animal-rights movement).

NEWYORKER: Hellhole

"There are people who crave cheese, " says Barnard, a vegetarian who is also active in the animal-rights movement.

FORBES: Food on the Brain

Francis is especially loved by partisans of leftist causes: the animal-rights movement, feminism, ecology, vegetarianism (though he was not a vegetarian).

NEWYORKER: Rich Man, Poor Man