Final answer:
The person in the question is Charles Darwin, who developed the theory of natural selection and published 'On the Origin of Species' in 1859.
Step-by-step explanation:
The person described in the question is Charles Darwin, a British naturalist and author renowned for his groundbreaking contributions to the science of evolution. Darwin got married and moved to Down in 1838 and spent the years between 1838 and 1858 developing and silently refining his ideas on species evolution and natural selection without publishing his work. In 1858, in collaboration with Alfred Wallace, Darwin presented papers on natural selection to the Linnean Society in London. This was followed by the publication of his influential book, On the Origin of Species, in 1859, which detailed his arguments for evolution through natural selection and had a profound impact on the scientific community as well as society at large.