- 2016 – present: Professor (full), Department of Mathematics, University of Colombo.
- 1999 – 2016: Senior Lecturer, Department of Mathematics, University of Colombo.
- 1995 – 1999: Graduate Teaching Assistant, Department of Mathematical Sciences, University of Memphis.
- 1994 – 1995: Temporary Lecturer, Department of Mathematics, University of Colombo.
- 1986 – 1993: Graduate Teaching Assistant, Department of Mathematics, Ohio State University.
- 1986 – 1986: Temporary Assistant Lecturer, Department of Mathematics, University of Colombo.