In Memoriam: Prof. Roumen P. Maleev, August 17, 1943 - December 16, 2019

Roumen Petrov Maleev was born on August 17, 1943 in the city of Samokov, Bulgaria. He graduated from the Department of Mathematics at Bucurest University in 1967. In 1970 he was appointed as Assistant in the Faculty of Mathematics and Mechanics of Sofia University “St. Kl. Ohridski”, where he became Associate Professor in 1983 and Full Professor in 2006.R. Maleev specialized in Moscow State University in the scholarly year 1971/72 and in Warsaw University in 1982 (February--April). He defended his PhD in Sofia University “St. Kl. Ohridski” in 1975 and his DSci dissertation in 1996 (also in Sofia University “St. Kl Ohridski”). During 1989-1995 he served as Deputy Dean of the Faculty of Mathematics and Informatics of at Sofia University “St. Kl. Ohridski”. He has been Head of the Department of Mathematical Analysis of the Faculty (1998--2000) and member of the Specialized Scientific Council on Mathematics and Mechanics (1995--2004).Maleev delivered lecture courses as Visiting Professor in South Florida University in the summer term of 1991 and in the Athens University in May-June 1997. He also presented numerous lectures at various international conferences worldwide.The scientific interests of Prof. Maleev were in the fields of Geometry of Banach spaces, Functional Spaces and Operators, Variational Analysis, Mathematical Analysis, Education in Mathematics and Informatics, Numerical Analysis.