 Although Gregorio Klimovsky was one of the founding fathers of the philosophy of science in Argentina, he was still active until the first decade of the twenty-first century. He introduced mathematical logic and axiomatic set theory in Argentinian universities and defended a hypothetico-deductive method close to that of Popper, not only for natural sciences but also for social sciences. At the turn of the century, he published three books that were very relevant in university education (Klimovsky 1994, Klimovsky and Hidalgo 1998, Klimovsky and Boido 2005). Moreover, his autobiography (2008) presents a vivid portrayal of the inception of analytic philosophy of science in Argentina. But perhaps the most important merit of Klimovsky was having been the teacher of several generations of Argentine logicians and philosophers of science such as Tomás Moro Simpson, Raúl Orayen, and Alberto Coffa.