Ernst Heinrich Philipp August Haeckel (February 16, 1834 – August 9, 1919), was an eminent German biologist, naturalist, philosopher, physician,
professor and artist who discovered, described and named thousands
of new species, mapped a genealogical tree relating all life forms,
and coined many terms in biology, including anthropogeny, ecology,
phylum, phylogeny, stem cell, and the kingdom Protista.