Wacław Sierpiński was a Polish mathematician born on March 14, 1882, and he is best known for his work in set theory, topology, and number theory. He made significant contributions to the understanding of cardinal numbers and continuum hypothesis, and he is also famous for the Sierpiński triangle, a fractal that illustrates self-similarity. Sierpiński was a prominent figure in the development of mathematical logic and contributed to the field of mathematical education. He held various academic positions, including at the University of Warsaw, and was a member of several scientific societies. He passed away on October 21, 1969.