J.B.S. Haldane was a British geneticist and evolutionary biologist, born in 1892. He made significant contributions to the field of population genetics and is known for his work on the mathematical theory of natural selection. Haldane's research helped to bridge the gap between Mendelian genetics and Darwinian evolution, providing a clearer understanding of how traits are inherited and evolve over time. In addition to his scientific work, Haldane was also a popular science communicator and wrote extensively for the public. He was a proponent of scientific socialism and had a keen interest in the implications of science on society. Haldane passed away in 1964, leaving a lasting legacy in both science and literature.