<p>Part I. Twardowski’s School. The Period of Crystallization of LWS.- Introduction. The School: Its Geneses, Development and Significance.- Kazimierz Twardowski: a great teacher of great philosophers.- Jan Łukasiewicz: a creator of new ideas in logic and a reinterpreter of its history.- Kazimierz Ajdukiewicz:The Cognitive Role of Language.- Tadeusz CzeŜowski.- Tadeusz Kotarbinski: Socrates of Warsaw.- Zygmunt Zawirski’s life and scientific work.- Stanisław Leśniewski: Original and Uncompromising Logical Genius.- Izydora Dąmbska: the first lady of the twentieth century Polish philosophy.- Maria Kokoszyńska-Lutman.- Seweryna Łuszczewska-Romahnowa.- On existential dependence and independence in the world of thoughts and states of affairs.- The Biography of Józef I.M. Bocheński.- Jan Salamucha (1903-1944).- Part II. Warsaw School of Logic, its main Figures and Ideas. The Period of Prosperity.- Łukasiewicz and his followers in many-valued logic.- Tomorrow’s sea-battle and the beginning of temporal logic.- Leśniewski and Mereology.- Alfred Tarski (1901–1983).- Stanisław Jaśkowski: life and work.- Czesław Lejewski: Propagator of Lvov–Warsaw Ideas Abroad.- Adolf Lindenbaum, metric spaces and decompositions.- Andrzej Mostowski, a biograpical note.- Jerzy Słupecki (1904–1987).- Bolesław Sobociński. The Ace of the Second Generation of the LWS.- Many-Valued Logics in the Iberian Peninsula.- Ontology of logic and mathematics in Lvov-Warsaw School.- A view of revival of Mathematical Logic in Warsaw, 1945 -1975.- Andrzej Mostowski and the notion of a model.- All Quantifiers versus the Quantifier All.- Helena Rasiowa (1917-1994).- Andrzej Grzegorczyk, a logician par excellent.- Roman Suszko – logician and philosopher.- Backmatter</p>