Ernst Heinrich Haeckel was a prominent German naturalist, biologist, philosopher, physician, and artist of the 19th century. He is best known for coining and popularizing the term ecology, and for his contributions to the theory of evolution. Some synonyms for Ernst Heinrich Haeckel include "evolutionary biologist," "natural historian," "ecologist," "taxonomist," "zoologist," and "artist." He was a prolific writer and his books, essays, and drawings continue to inspire and inform scientists and artists alike. His contributions to our understanding of the natural world and the interconnectedness of all living things make him an important figure in the history of science.