Robert Harding Whittaker was a
distinguished. American plant ecologist who
was the first to propose the five-kingdom
taxonomic classification of the world's biota into
the Animalia, Plantae, Fungi, Protista, and
Monera in 1969. He also proposed the Whittaker
Biome Classification, which categorized
biometypes upon two abiotic factors:
temperature and precipitation.