Sam Drake

Aristotle 350 B.C.

He was the first to classify organisms on the basis of their structural similarities.

Linnaeus 1735

A Swedish botanist at the University of Uppsala. He had a great talent for collecting and classifying objects, especially flowers.

Haeckel 1866

He was a German, naturalist, philosopher, biologist, physician, professor and artist who discovered, describes and names thousands of new species. He named thousands of new species, mapped a genealogical tree relating all life forms, and coined many terms in biology, including anthropology, ecology, phylum, phylogeny, stem cell, and the kingdom Protista

Chatton 1925

He was a French biologist who first characterized the distinction between the eukaryotic and prokaryotic systems of cellular organization

Copeland 1938

He was an American biologist who contributed to the theory of biological kingdoms. He was responsible for the fourth kingdom, Monera.

Whittaker 1969

He was a distinguished American plant ecologist, active in the 1950s to the 1970s. He was the first to propose the five-kingdom classification.

Woese 1990

He was an American microbiologist and biophysicist. He defined the Archaea in 1997.

Cavalier-Smith 1998

One of his major contributions to biology was his proposal of a new kingdom of life: the Chromista.