Positions:
· Mathematician at the Computing Centre of Bulgarian National Bank, 1980-1981.
· Assistant Professor at the Centre of Applied Mathematics, Technical University Sofia, 1981.
· Researcher at the Section of Differential Equations (1985-1987), at the Section of Mathematical Physics (1987-1993), Institute of Mathematics of Bulgarian Academy of Science.
· Senior Researcher at the Section of Mathematical Physics, Institute of Mathematics of Bulgarian Academy of Science, since February 1993; since 1994 Head of the Section.
· Associate Professor at the Department of Mathematics, Fatih University, Turkey, 2000-2001.
· Associate Professor at the Department of Mathematics&Statistics, College of Science, Sultan Qaboos University, Sultanate of Oman, since 2003.