Lev and his father, Solomon Kozachkov, 1933 Lev and his parents, Hannah&Solomon Kozachkov, 1946 Lev at work, Regional House of Scientific and Technical Propaganda Lecture Lev with Alex, 1972 Lev with Gina, 1978 Lev at work Lev and Henry Kozachkov, the last picture, 8/29/1987 Leo Kozachkov's MIT PhD Defense - dedication to Prof. Lev Kozachkov, 2022