Mosyakin is the director of the M.G. Kholodny Institute of Botany, National Academy of Sciences (NAS) of Ukraine (Kyiv, Ukraine), as well as the head of the Vascular Plants Department. Since September 2011, he hes been the president of the Ukrainian Botanical Society; head of the plants subcommittee of the National Commission on the Red Data Book of Ukraine; editor-in-chief of the Ukrainian Botanical Journal; member of the editorial boards of Botanica (Lithuania), Biodiversity Research and Conservation (Poland), and other botanical periodicals. He is a corresponding member of the NAS of Ukraine (2012), holds a Doctor of Sciences degree in biological sciences (2003) from M.G. Kholodny Institute of Botany, and has been a professor of botany since 2006. He was awarded by NAS Ukraine “For Professional Achievements” (2011) and “For Scientific Achievements” (2021). The Ministry of Education and Science of Ukraine bestowed him for his educational achievements with the Petro Mohyla (2008) and Sofia Rusova (2005) awards. His main research interests include plant taxonomy, biogeography and ecology, botanical nomenclature, biodiversity conservation, and science education.