Aleksandr Khinchin was a prominent Russian mathematician born on March 19, 1894, in Moscow. He is best known for his contributions to the fields of probability theory and mathematical statistics. Khinchin's work laid the foundation for many modern statistical methods and concepts, including the Khinchin's theorem, which relates to the convergence of random variables. Throughout his career, Khinchin published numerous papers and books, significantly influencing the development of probability theory. He also contributed to the study of Fourier analysis and number theory. Khinchin passed away on July 31, 1959, leaving a lasting legacy in mathematics.