Charles Darwin was an English naturalist, geologist and biologist known for his contributions to evolutionary biology.
Gregor Mendel, an Austrian scientist, is renowned as the father of modern genetics for his pioneering work on pea plants, establishing the principles of heredity.
Thomas Henry Huxley, a prominent British biologist and comparative anatomist, championed Darwin's theory of evolution and was known as "Darwin's Bulldog.
Ernst Mayr was a renowned biologist, ornithologist, and historian of science who made significant contributions to the field of evolutionary biology.