100 Scientists

Ernst Heinrich Philipp August Haeckel (February 16, 1834 – 1919) was a philosopher, professor, physician, naturalist, biologist and artist.

Early Life and Contributions:

After receiving a degree in medicine in 1857, Haeckel obtained a doctorate in zoology from the University of Jena and taught zoology there. Haeckel’s contributions to zoological science were a mixture of sound research and assumptions often with insufficient evidence. He was a renowned figure whose popularity with the public was substantially higher than it was with many of his scientific peers.

Legacy:

Although best known for the famous statement “ontogeny recapitulates phylogeny”, he also invented many words commonly used by biologists today, such as phylum, phylogeny, and ecology. On the other hand, Haeckel also stated that “politics is applied biology”, a quote used by Nazi propagandists. The Nazi party, rather unfortunately, used not only Haeckel’s quotes, but also Haeckel’s justifications for racism, nationalism and social Darwinism.
Haeckel also proposed the idea that all multicellular animals derived from a theoretical two-layered (ectoderm and endoderm) animal, the Gastraea, a theory that provoked much discussion. He engaged in much valuable research on marine invertebrates, such as the radiolarians, jellyfish, calcareous sponges, and medusae, and wrote a series of monographs on these groups based largely on specimens brought back by the Challenger Expedition.
He was also the first to divide the animal kingdom into unicellular and multicellular animals. An ardent Darwinist, Haeckel made several zoological expeditions and founded the Phyletic Museum at Jena and the Ernst Haeckel Haus, which contains his books, records, and other effects.
An effective popularizer of science, Haeckel produced numerous tree diagrams, showing evolutionary relationships between different species. Modern scientists and science historians have varied on the value of these diagrams but many also praised his work and creativity. Haeckel also produced artwork, much of it quite beautiful, starting with his atlas of radiolarians, published in 1862.
It has been argued that what he saw was influenced by Jugendstil, the Art Nouveau form popular in Germany at the time. Whether or not artistic style influenced Haeckel’s illustrations, his illustrations certainly influenced later art forms, including light fixtures, jewelry, furniture, and even a gateway to the Paris Word Fair in 1900. In 1906 the Monist League was formed at Jena with Haeckel as its president. The League held a strong commitment to social Darwinism in which man was seen as part of nature and in no way qualitatively distinct from any other organic form.
Later in his career, Haeckel produced Art Forms in Nature, a work that he published in a series of 10 installments. Designed to interest the general public in naturalism, Haeckel’s own illustrations of animals, plants and microscopic organisms were introduced. In 1913, he published a set of photographs titled Nature as an Artist, aimed at countering allegations that his illustrations could be misleading. Today, however, many scientists and science historians share the conviction that his images were often highly contrived, beautiful as they may be.
Haeckel was the first person known to use the term “First World War”. Shortly after the start of the war Haeckel wrote:

“There is no doubt that the course and character of the feared “European War” will become the first world war in the full sense of the word.”

The “European War” became known as “The Great War”, and it was not until 1931, with the beginning realization that another global war might be possible, that there is any other recorded use of the term “First World War”.
He was one of the first to consider psychology as a branch of physiology. His chief interests lay in evolution and life development processes in general, including development of nonrandom form, which culminated in the beautifully illustrated art forms of nature.
Although Haeckel’s ideas are important to the history of evolutionary theory, and he was a competent invertebrate anatomist most famous for his work many speculative concepts that he championed are now considered incorrect but still he has been admired greatly for his work.