Hugo Steinhaus was a prominent Polish mathematician born on March 14, 1887, in Lwów, which is now part of Ukraine. He is best known for his contributions to functional analysis and probability theory. Steinhaus played a significant role in the development of mathematics in Poland and was a co-founder of the Polish Mathematical Society. In addition to his research, Steinhaus was an influential educator and mentor to many students, including the famous mathematician Andrzej Kolmogorov. He also collaborated with other notable mathematicians, such as Stefan Banach, and contributed to the establishment of the Lwów School of Mathematics. Steinhaus passed away on April 25, 1972.