Whose classic experiments showed that infant monkeys preferred comfort over food?

Harry Harlow, an American psychologist, carried out his famous rhesus monkey studies at the University of Wisconsin in the 1950s and 1960s. His experiments showed that infant monkeys often clung to a cloth-covered surrogate mother even when the wire surrogate provided food, reshaping ideas about attachment. The work became a landmark in developmental psychology and helped influence child-rearing and attachment theory. Today, Harlow’s experiments are also remembered for the ethical concerns they raised about animal research.