University of Warsaw.
After graduating in law at the Russian-language Imperial Warsaw University, he moved to Berlin, where he began studies in the history department of Unter den Linden University. Afterwards Handelsman continued his studies at various European universities including Paris, Zürich (where he received his doctorate in 1908), Rapperswil, Vienna and finally London. During World War I, in 1915, he returned to Warsaw and joined Warsaw University as a professor of modern history.
One of the most prominent historians of the age, between 1918 and 1939 he was also the editor-in-chief of the Historical Review and the head of a Commission for the Atlas of History of Polish Lands (1920-1935).
Initially a medievalist, in the Interbellum Handelsman devoted much study to 19th-century Polish political history, including the works of Prince Adam Jerzy Czartoryski and the Hôtel Lambert circle. After the outbreak of World World War II Marceli Handelsman hid from the Germans because of his Jewish roots.
Nevertheless, he took an active part in underground education in Poland during World World War II and served as a professor in the underground Warsaw University. After 1942, under the noms de guerre "Maciej Romański" and "Maciej Targowski," he worked with the Bureau of Information and Propaganda of the Headquarters of the Home Army.
Arrested by the Gestapo in 1944, he was sent to Gross-Rosen concentration camp.
Subsequently transferred to Mittelbau-Dora concentration camp, he was murdered on 20 March 1945.
In 1906, however, he was dismissed from the school because of his involvement in socialist organizations.
He was also appointed a member of the Polish Academy of Learning. He was also a member of the Academy of Moral and Political Sciences in Paris and the London-based Royal Society.