One of the last century's most influential observers of children was the Swiss biologist

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The Swiss biologist referred to here is Jean Piaget, who is known for his groundbreaking work in developmental psychology and cognitive development in children. Darwin was a biologist, but he did not focus specifically on children's development. Washburn was an influential psychologist, but her work focused on animal behavior rather than child development. James was a philosopher and psychologist who focused on the nature of consciousness and the mind, but again, his work did not specifically address child development.

One of the Last Century's Most Influential Observers of Children