Sir Ronald Aylmer Fisher was a statistician and geneticist who is credited for setting the course of modern statistics. Many of the important concepts in statistics are his contribution; these include ‘maximum likelihood’, ’fiducial inference’. Fisher was born in London and educated at institutions such as the ‘Harrow School’ and ‘Cambridge University’. He was exceptionally brilliant and won scholarships throughout his student life. His career as a biostatistician commenced when he started working at the ‘Rothamsted Station’. Here, he had access to massive amounts of crop data which became the basis for some of his groundbreaking work in statistics. Fisher had a deep interest in evolutionary biology and used his mathematical genius to bring together the theories of Mendel and Darwin which till that point were thought to be irreconcilable. He showed that Mendel’s work on genetics actually supported Darwin’s arguments. Fisher’s research in experimental agriculture gave farmers the rational crop breeding method that saved time and energy. He was, however, not without faults,;he was a firm supporter of eugenics and harboured prejudices regarding race and class. Nonetheless, his legacy remains untarnished and he remains one of the most influential scientists of the 20th century.