Bill Tutte was a British mathematician and cryptanalyst, best known for his work during World War II. He played a crucial role in breaking the German Lorenz cipher, which was used for high-level military communications. His contributions significantly aided the Allied war effort and showcased the importance of mathematics in cryptography. After the war, Tutte continued his academic career, becoming a professor at the University of Toronto. He made significant advancements in graph theory and combinatorics, influencing the field of mathematics. His legacy includes numerous publications and the recognition of his work in both mathematics and cryptography.