Olga Ladyzhenskaya, a renowned Russian mathematician, passed away on January 12, 2004 at the age of 81. She was born on March 7, 1922, in Kologriv, Russia. Ladyzhenskaya was a pioneering figure in the field of mathematics, specifically in partial differential equations. She received her doctoral degree in 1944 from Moscow State University and went on to hold various teaching positions in Moscow. In 1970, she became the first female mathematician to be elected a full member of the Russian Academy of Sciences. Throughout her career, Ladyzhenskaya made significant contributions to the understanding of fluid dynamics, which has had an impact on a wide range of fields such as weather forecasting, climate modeling, and aerodynamics. Her research also extended to the fields of mathematical physics and differential geometry. In addition to her research, Ladyzhenskaya was also a devoted mentor to numerous students, many of whom went on to become notable mathematicians themselves. Her works have been recognized and honored with numerous awards, including the Lomonosov Gold Medal in 2002, which is the highest scientific award in Russia. Ladyzhenskaya also held honorary doctorates from prestigious universities around the world. Ladyzhenskaya's contributions to mathematics will continue to be remembered and honored by the scientific community. Her legacy serves as an inspiration for many, especially to women in the field of mathematics. She is survived by her husband, Vladimir Avgustovich Kuznetsov, and two children. Ladyzhenskaya will be greatly missed by her family, colleagues, and students.