Chen-Ning Yang is a prominent Chinese-American physicist known for his significant contributions to theoretical physics. Born on September 1, 1922, in Hefei, China, he is best known for his work on the Yang-Mills theory, which has had a profound impact on particle physics and the development of the Standard Model. In 1957, Yang, along with Tsung-Dao Lee, was awarded the Nobel Prize in Physics for their groundbreaking work on the law of parity violation in weak interactions. Their research challenged existing beliefs about symmetry in physics and opened new avenues for understanding fundamental forces in the universe.