Stanisław Lencewicz was born on 19 April 1889, in Warsaw. After finishing a secondary school he worked as a teacher. In 1913- 1916 he studied in Neuchâtel under the guidance of professor E. Argand obtaining the title of a doctor in exact sciences. His habilitation took place in 1919 in Lviv under the tutorship of professor E. Romer. In 1922 he obtained the associated professorship and in 1931 the full professorship at the University of Warsaw. In 1916-1919 he lectured the geographic subjects at the Free Polish Public University, at the Technical University, at the Military School of Topographers, and at the National Institute of Pedagogy. In 1918 he brought into existence the Department of Geography at the University of Warsaw and he ran this department from 1920 to the outbreak of the II World War. He promoted 8 doctors and two of them obtained habilitation. Professor Lencewicz conducted research in the Małopolska Upland, in the Alps, in the Tatras, and later mainly in the Central Poland and in Polesie. Until 1939 he published 195 papers on geomorphology, hydrography, cartography, regional geography, human geography, and others, including two highly appreciated textbooks on the regional geography of Poland. He actively participated in the international scientific life. Professor presented papers at over a dozen international geographic conventions and conferences (among others in Cairo, Cambridge, Paris, and Amsterdam) and a few of them he co-organized himself. Profesor Lencewicz took part in all activities related to the Polish interwar geography. He co-founded the Polish Geographic Society, he was a member of its board and the President of its Warsaw office. He edited „Przegląd Geograficzny” and took part in the organization of the Military Institute of Geography where he later worked. He was a member of the Warsaw Scientific Society and of the Geographic Commission at the Polish Academy of Learning, a honorary member of the Czechoslovakian Scientific Society, and a correspondent member of the Geographic Societies in Mexico and in Belgrade. He contributed to the International Geographic Bibliography. He was honoured with many Polish and foreign decorations for his achievements: among others with the Officer's Cross Polonia Restituta, with the Cross of Independence with Swords, with the badge of honour of the Military School of Topographers. He spent the occupation in Warsaw in difficult conditions, earning a living as a clerk in the Municipal Waterworks office. He participated in the conspiratorial scientific and didactic life of the Faculty of Mathematics and Natural Science at the University of Warsaw. In 1943-1944 he lectured at the underground courses. He worked upon the new textbooks of general physical geography and of the geography of Europe (partially published after the war). He was murdered by the Nazis in the action of dislodging civilians during the Warsaw Uprising, September 1, 1944.