The article analyzes the life and creative path of the outstanding Ukrainian historian, Professor Grygorii D. Kazmyrchuk, who turns 75 years old. He has devoted more than 30 years of teaching to Taras Shevchenko Kyiv National University, a well-known Decembrists-scholar, historiographer and researcher of his native village of Kalknyk. The article also covers the genus of the hero of the anniversary, his family circle. A brief historical note was given of GrygoriiDmitrovich's hometown of Kalknyk village, where he was born, thanking the Kalnitsky community, investigating his history. Grygorii D. Kazmyrchuk is the founder of the School of Decembrists Studies at the Taras Shevchenko National University of Kyiv. His works are widely known abroad. The hero of the anniversary actively cooperates with the international community in the study of various history issues. He trained more than 10 candidates in this direction (A. Kulikovska, R. Lavrenyuk, A. Verbovy, L. Gubitsky, O. Lyapina, Iu. Latysh and others). Active participants of the Decembrist school were: O. Rafalsky, A. Silkin, Yu. Shlapak, V. Smirnov, T. Orlova and others. The hero of the anniversary for the first time gave the definition of the Decembrist school, developed the periodization of Decembrists movement and conducted biographical researches of the Decembrists and historians of the Decembrists (V. Bazylevych, V. Romanovsky, J. Germayze and others). Grygorii D. Kazmyrchukorganized of more than 10 congresses on Decembrists movement – «Decembrist Readings». He resumed and continued publishing papers collections of «Decembrists in Ukraine» (five papers collections appeared under his leading). G. D. Kazmyrchuk and O. P. Reent, who Headed of the Department of History of Ukraine at the end of the 19th and the beginning of the 20th century at the Institute of History of Ukraine of the National Academy of Sciences of Ukraine, developed a project devoted to the emergence of the Decembrist movement and held 5 International conferences on this problem. Now the project «Ukrainian Decembrist School 1825-2019» is being actively developed. G. D. Kazmyrchuk participates in the international project «Russian Decembrist Studies in Persons 1825 – 2019», where biographies of Decembrists of Ukraine of the ХIX and ХХ centuries are highlighted. Kazmyrchuk G. D. is an elder of the Kalynitsky Cossack Regiment and an honored researcher of local lore of Ukraine. He is the author of regional studies on the history of the Kalnyk village and the Kalnitsky Cossack Regiment etc. For example, the latest edition «Kalnycky Cossack Regiment (1648–1712)» (2019) is devoted to the history and the battle route of Kalnik people. His research interests are focus on History of Ukraine, Local History, Historiography, Bibliography, World History, Social History, Biography, Shevchenko Studies, Decembrist Studies, History of University and History of Education etc. The hero of the anniversary has a rich life experience, which is happy to convey to the younger generation, their own children and grandchildren. Homeland and colleagues sincerely congratulate Grygorii Dmitrovich on the occasion of the 75th anniversary and wish him strong health and longevity!