Konstantin Sergeevich Riutin (born 9.04.1977 in Moscow) works at the department since 2003; since 2005 as an assistant and as an associate professor since 2012. He is a student of Sergei Vladimirovich Koniagin. Scientific interests of Riutin include functional analysis and theory of functions. He has published several articles and defended Ph.D. thesis (2002) on these subjects.