O. F. (Orator Fuller) Cook

Born in 1867 and active into the mid-20th century, O. F. Cook was an American botanist, entomologist, and agronomist whose interests reached well beyond any single field. He is often noted for his work on cotton and rubber cultivation, and for using the term "speciation" to describe how new species arise.

Cook published extensively, with hundreds of articles touching not only on plant science and insect studies but also on genetics, evolution, geography, anthropology, and sociology. That range gives him an unusual place in scientific history: he was the kind of researcher who moved easily between practical agricultural problems and big-picture questions about how life changes over time.

He died in 1949. Today he is remembered as a prolific and curious scholar whose work connected agriculture, natural history, and evolutionary thought.