Kotelnikov, Vladimir: - Vladimir Kotelnikov was born in Moscow on 9 December 1951. He graduated from the Moscow Aviation Institute (University) in 1975 and was engaged in research and development in the area of high-temperature strength. Vladimir defended the academic degree of the Candidate of Science in 1981 and read lectures on aircraft piston engine design at the Moscow Aviation Institute. Since the 1980s Kotelnikov has conducted archive research on the history of Russian aviation of the inter-war and Second World War periods. In addition, he paid specific attention to the history of foreign aircraft testing and operations in Russia. As the result of his work he published several hundred articles and dozens of books in Russia, Ukraine, Poland, United Kingdom, France, Germany, Spain, and the United States, among them Lend-Lease and Soviet Aviation, Americans in Russia, Russian Piston Aero Engines, Early Russian Jet Engines, Air War Over Khalkhin Gol, Le Petlyakov Pe-2 and others. Being an aviation historian, he received a diploma as a professor of the Academy of Aviation and Aeronautics Science and currently acts as a consultant on piston aero engine design to Russian aviation museums as well as to different aircraft restoration groups. From 2003 Vladimir held the post of an editor of the Aviakollektsiya aviation history journal, published in Moscow. He passed away in 2022.