Nikolai Bogolyubov was a prominent Russian mathematician and theoretical physicist, known for his significant contributions to the fields of quantum mechanics and statistical mechanics. Born on May 21, 1909, he developed various mathematical methods that are widely used in modern physics, particularly in the study of superfluidity and superconductivity. Throughout his career, Bogolyubov published numerous papers and collaborated with many notable scientists. He was also instrumental in establishing the Bogolyubov Institute for Theoretical Physics in Kiev, which continues to be a center for research in theoretical physics. He passed away on February 13, 1992, leaving a lasting legacy in the scientific community.