On August 2, 1997 a tragic accident ended the life of a prominent Person, a well-known scientist, an associate, public figure in Lithuania, Member of the Lithuanian Academy of Sciences, Professor Algirdas Žukauskas. The life of the academician Algirdas Žukauskas was both fruitful and diverse. His talent, combined with an analytical mind and an exceptional industries, persistence and consistence in the direction, was in an exceptional degree exhibited both in scientific research and in everyday research with a strategic leadership of large institutions and societies. Prof. A. Žukauskas was the initiator of investigations on heat transfer in Lithuania, the founder and the head of the Lithuanian School of thermal physics, which became known all over the world. He was the Member of the Lithuanian Academy of Sciences, its long-term vice-president. Doc. Habil., Professor, Merit Scientist. A. Žukauskas was born of February 2, 1923 in Lithuania. A. Žukauskas graduated in 1947 the Department of Mechanics at the Vylaulas Magnos University in Kaunas as a mechanical engineer in thermal engineering. As a post graduate he worked as an assistant lecturer, and continued the scientific work. Here he became interested in one specific problem, very important at that time, namely, heat transfer by convection in flows of different fluids over transverse single cylinders and bundles of tubes. During 1952 and 1953 he resided at the Moscow Energy Institute (MEI), at the Department of Fundamental Thermal Engineering. He defended with a high success in 1953 his Cand. of Tech. Sci. Thesis. In Moscow at the ENIN A. Žukauskas defended in 1963 his Doctor's Thesis. This was an extended study and interpretation of heat transfer by convection in flows of viscous fluids with variable physical properties.