J. B. S. (John Burdon Sanderson) Haldane

Born in Oxford in 1892, J. B. S. Haldane became one of the key figures in 20th-century biology. He worked across genetics, evolution, physiology, and mathematics, and is widely remembered as one of the thinkers who helped unite Darwin’s theory of natural selection with modern genetics. He also served in the First World War and later taught and researched in Britain.

Haldane was known not just for his science but for the force of his personality and his gift for explanation. He wrote essays and popular science books that made difficult ideas lively and approachable, and he was never afraid of argument or bold opinions. That mix of deep learning and plain speaking still makes his work feel fresh.

In 1957 he moved to India with the biologist Helen Spurway, and he later became an Indian citizen. He continued his research there until his death in 1964, leaving behind a reputation as both a major scientific thinker and a memorable public intellectual.