Abstract: This memorial article is dedicated to the memory of Igor Nikolaevich Kiselyov, a man who did a lot in the field of informatization of historical science and archival business. Igor Nikolaevich started working as a quantifier historian, a specialist in the field related to the application of mathematical methods and computer technologies in historical research. He actively participated in research projects on historical demography and other areas of historical science, in 2002 for a series of works on the history of the Russian population in the 1930s, Yu.A. Polyakov, V.B. Zhiromskaya and I.N. Kiselyov were awarded the V.O. Klyuchevsky Prize of the Russian Academy of Sciences.
In the 1990s, the main Igor Nikolaevich became interested in archival issues: issues of informatization of archival business, creation and analysis of online archival resources.
Igor Nikolaevich was one of the leading experts in the field of historical informatics, was a member of the Council of the Association "History and Computer", conducted teaching work as an associate professor at the IAI of the Russian State University.    The article uses the memoirs of colleagues, materials of publications by I.N.Kiselyov in historical journals, in the journals "Domestic Archives" and "Archivist's Bulletin", "AIK Newsletter". as well as materials about his leadership in the development of the Concept and Program for the Informatization of Archival Affairs in Russia, the first version of the Archives of Russia portal, and participation in many archival information projects. The article highly appreciates the research work of I.N.Kiselyov and his scientific and organizational activities at the Rosarchive, where he headed departments related to informatization, the organization of research work of the Federal Archival Service of Russia and the introduction of automated archival technologies.
Igor Nikolaevich was seriously engaged in both theoretical and methodological problems of archival science. Literally until the last day, Igor Nikolaevich conducted active scientific and organizational work in breakthrough areas of archival science. His latest article "On the use of artificial intelligence in text recognition" was published in the first issue of the VNIIDAD Bulletin posthumously, and a joint scientific report "The use of artificial intelligence in document management in archives: practice, trends and prospects" was presented by his colleagues after Igor Nikolaevich passed away.

Abstract: This article is dedicated to the memory of Tamara Fedorovna Izmestyeva, a well-known specialist in the field of economic history and historical information science. A graduate of the Faculty of Economics of Moscow State University, she began her scientific and teaching work at the Faculty of History in 1969 at the Department of Source Studies, then as a researcher and senior researcher at the interdepartmental Laboratory of Historical Information Science, transformed into the Department of the same name.
Tamara Fyodorovna's research interests lay in the mainstream of both economic history and historical information science. In 1991, the publishing house of Moscow State University published a monograph based on her dissertation "Russia in the European market system, late XIX – early XX century".
T.F.Izmestyeva became one of the founders of the Association "History and Computer" (AIK), she was a member of the organizing committees of many AIK conferences, participated in the organization of schools for young scholars. The article uses publications by T.F. Izmestyeva in the journals "Russian History", "Economic History. Review", "Historical Information Scince", "AIK Newsletter", her presentations at Russian and international conferences, memoirs of colleagues and students. The article gives a high assessment of T.F. Izmestyeva's research and teaching work. Publications on economic history reflected her interests in the field of studying the foreign market of the Russian Empire, analyzing mass statistical sources. Tamara Fyodorovna introduced "economic tools" into research on economic history.
In the field of historical information science, she paid much attention to the creation of historically oriented databases, source studies and methodological problems of working with mass statistical data.
She has co-authored a number of textbooks, including "Quantitative Methods in Historical Research", "Historical Information Science", "Computerized Statistical Analysis for Historians", "Inforfmation Science for Humanities", "Information Technology for Historians".