Harald Cramér was a prominent Swedish mathematician, born on September 25, 1893, and known for his significant contributions to probability theory and statistics. He played a crucial role in developing the Cramér-Rao bound, a fundamental concept in statistical estimation that provides a lower bound on the variance of estimators. Cramér also contributed to the field of mathematical statistics and was involved in the establishment of the Swedish Statistical Society. His work laid the groundwork for many modern statistical methods, and he is remembered for his influence on both theoretical and applied statistics. Cramér passed away on October 5, 1972.