Sergey Yudintsev received his Ph.D. degree in Geochemistry in 1989 and his D.Sc. degree in Mineralogy in 2009 from the Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Russian Academy of Sciences (IGEM RAS). He has worked at the IGEM RAS since 1986, and his current positions are that of Principal Researcher and Head of the Laboratory of Radiogeology and Radiogeoecology. His research topics mainly include the nuclear fuel cycle, high-level radioactive waste, actinides, immobilization, ceramics, glass-ceramics, glass, and geological disposal.