This article pays tribute to Evgeniya Nikolaevna Tarasova (1938–2017), a renowned hydrochemist, biogeochemist, and Baikal scientist. It sheds light on her research findings and contributions to the field. Over her 56-year professional life, E. N. Tarasova studied the organic matter of Lake Baikal: its composition, distribution, transformation, seasonal variability, balance, and biogeochemical circulation of organic carbon, silicon, mineral and organic forms of nitrogen and phosphorus in both suspended and dissolved fractions, suspended matter and chlorophyll а. In the 1990s, E. N. Tarasova emerged as the leader of a group of researchers investigating the biogeochemistry of persistent organic pollutants in the aquatic and terrestrial ecosystems of Lake Baikal and the Lake Baikal region. E. N. Tarasova’s research encompasses a wider range of objects, including the waters, sediments, and biota of Lakes Baikal, Hovsgol, and Teletskoye. She also examined their tributaries such as the Lena and Angara Rivers, as well as the Angara reservoirs and other waterbodies of the Lake Baikal region and Mongolia. Additionally E. N. Tarasova investigated atmospheric air, atmospheric precipitation, soil, terrestrial vegetation, food and bio-substrates of residents in the Lake Baikal region, as well as some areas of the Asian territory of Russia, Mongolia, and Belarus. E. N. Tarasova’s research findings are presented in 487 printed and handwritten works, including 4 monographs.