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Charles Darwin was an English naturalist who proposed and provided evidence for the theory that all species have evolved over time from a common ancestor through the process of natural selection. This theory came to be accepted by the scientific community in modified form, forming much of the basis of modern evolutionary theory, a cornerstone of biology. His five-year voyage on the Beagle established him as a prominent geologist whose observations and theories supported uniformitarianism. Puzzled by the geographical distribution of wildlife and fossils he collected on the voyage, Darwin investigated the transmutation of species and conceived his theory of natural selection in 1838. In 1858, Alfred Russel Wallace sent him an essay describing a similar theory, causing the two to publish their theories in a joint publication. His 1859 book On the Origin of Species established evolution by common descent as the dominant scientific explanation of the diversity of life in nature.