Aleksander Rajchman

Warsaw School of Mathematics of the Interwar period. He had origins in the Lwów School of Mathematics and contributed to real analysis, probability and mathematical statistics

National Philharmonic in Warsaw in the years 1901–1904. Mother Melania Amelia Hirszfeld was a socialist and women's rights activist who wrote both critical essays and woman affairs' texts under pseudonyms or anonymously for a few Polish weeklies, organized maternal rallies where she drew attention to the need to improve the household to facilitate women's lives, and was an active member of the secret organization Women's Circle of Polish Crown and Lithuania, and later also the Association of Women's Equality in Warsaw. Rajchmans ran a social salon who hosted many Polish artists of their times, in particular Eliza Orzeszkowa, Maria Konopnicka, and Zenon Pietkiewicz. His older sister a Polish independence activist and historian of education Helena Radlińska was the founder of Polish social pedagogy, his older brother a physician and bacteriologist Ludwik Rajchman was the world leader in social medicine and director of the League of Nations Health Organization, the founder of the United Nations International Children's Emergency Fund (UNICEF) and its first chairman in the years 1946–1950. His nephew a Polish-American electrical engineer Jan A. Rajchman was a computer pioneer who invented logic circuits for arithmetic and magnetic-core memory to result in development of high-speed computer memory systems and whose son John Rajchman is a noted American philosopher of art history, architecture, and continental philosophy. His first cousin a microbiologist and serologist Ludwik Hirszfeld co-discovered the heritability of ABO blood group type and foreseen the serological conflict between mother and child.^[1]

Jew. He died in Sachsenhausen concentration camp, Oranienburg, Germany