N. P. Ladeishchikov's life and scientific legacy (on the occasion of the 100<sup>th</sup> anniversary of his birthdate)
We outline the scientific activity of N. P. Ladeishchikov, an eminent Siberian climatologist and geographer, who devoted his life to research into the climatic conditions of East Siberia. The research area, pioneered by the scientist, was instrumental in obtaining impressive results from studying the climatic influence of Lake Baikal on surrounding land and the local factors of weather formation in the lake 's hollow, and from determining the sanitary-hygienic indices of the climate in the Baikal region within the context of the promotion of recreation and tourism, which was appreciated at its true value by the national scientific community.