Robert Harding Whittaker was an American plant ecologist. He was the first to propose the Five Kingdom Taxonomic Classifications. The five kingdoms under Whittaker’s classification system are-Animalia, Plantae, Fungi, Protista, and Monera.
Carl Linnaeus is called the ‘Father of taxonomy’ and is also credited with classifying over 10000 organisms.
Ernst Haeckel is credited with the Three Kingdoms Classifications.
John Ray coined the term ‘species’.