This is a biographical sketch of one of the greatest scientists of the modern times. This biography rather than being a mere chronological compilation of the scientists life, lucidly illustrate the social and political ethos of his times. The transition from a scientist to a social and political activist comes alive, depicting him as a human being with a strong moral fibre who stood for justice all the times. The inclusion of several interesting anecdotes from his life add colour to the narrative and the scientific theories fomulated are explained a simple way.