John von Neumann was a Hungarian-American mathematician, physicist, inventor, computer scientist, and polymath. Born in Budapest into a Jewish family, he shifted to the USA before the rise of Nazi power. There he started teaching mathematics in Princeton University, but was not successful as a professor mainly because his students found it hard to keep up with his speed. Later, as he joined a non-teaching position at the Institute of Advanced Study which closely collaborates with Princeton University, he began to flourish truly. Although he began his career as a pure mathematician, he later became more interested in applied mathematics, and as the Second World War broke out, he used his knowledge to contribute to war efforts. Throughout his life, he had published over 150 papers. Among them, sixty were in pure mathematics; another sixty in applied mathematics; twenty in physics and the rest were on miscellaneous subjects. He was a prolific writer and his last book, written from hospital bed, was published posthumously as ‘The Computer and the Brain’.