The Theory Was Popularized By Charles Darwin
The theory of natural selection is associated with Charles Darwin. Darwin was an English scholar who focused his work in geology, biology and the natural world.
He famously traveled to the Galápagos Islands in 1832 and lived there for five years.
During that time, he watched the natural world, while collecting specimens and studying them. Darwin went on to collect data about the natural world for twenty more years and in 1859, his groundbreaking book, On the Origin of Species, was published. This shared his ideas about evolution with the world.
Darwin was the first person to state that all the species on Earth have descended from common ancestors. As such, he is seen as the godfather of evolution, of which his theory of natural selection is a cornerstone.