: Professor, Corresponding Member of the Bulgarian Academy of Sciences, Department of Bioinformatics and Mathematical Modelling, Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Sofia, Bulgaria.

Prof. Krassimir Atanassov was born on March 23, 1954 in Burgas, Bulgaria. He studied at Department of Mathematics in Sofia University and defended dissertations for PhDs in 1986 (Doctor of Technical Sciences), in 1997, and in 2000 (Doctor of Mathematical Sciences). Since 1998, he is a Full Professor in the Department of Bioinformatics and Mathematical Modelling of Institute of Biophysics and Biomedical Engineering of the Bulgarian Academy of Sciences. Since 2012, he has been a Corresponding Member of Bulgarian Academy of Sciences, since 2013 he has been a fellow of IFSA, and since 2018 he has been Senior of IEEE. He has more than 700 papers in journals, 300 conference reports and 35 monographs, and is a member of the Editorial Boards of more than 20 international journals. His research interests are in the areas of fuzzy sets, where he introduced the concept of intuitionistic fuzzy sets and investigated its basic properties and applications, mathematical modelling by generalized nets and their applications in artificial intelligence, systems theory, number theory, medicine, economics, etc., In the area of number theory his research interests include generalizations the Fibonacci sequence, properties of arithmetic functions, and formulation and solution to extremal and combinatorial problems.