John Littlewood was a prominent British mathematician known for his contributions to various fields, including analysis, number theory, and mathematical logic. Born on June 9, 1885, he worked closely with G.H. Hardy, another influential mathematician, and co-authored the famous book "A Course in Pure Mathematics." Littlewood's work on complex analysis and series has had a lasting impact on the field. In addition to his research, Littlewood was a dedicated teacher and mentor, influencing many students throughout his career. He was elected a Fellow of the Royal Society in 1925, recognizing his significant contributions to mathematics. Littlewood passed away on September 6, 1977, leaving behind a rich legacy in the mathematical community.