• BA (Kelaniya)
• PG Diploma – TESL (Colombo)
• M Ed-TESOL (Colombo)
• CELTA (Cambridge)
• ESP Methodology for Business communication (Institute of Chartered Accountants of Sri Lanka
• Certificate in Teaching in Higher Education (2015) – General Sir John Kotelawala Defence University, Ratmalana.

• English as a second language
• Teacher Training

• Student Heterogeneity in classes
• Materials Development
• Reading skills of ESL students

Full Time :

• Teacher of English Language and Literature (1990-2011)
• Project Officer –National Institute of Education (2012-2013)

Part Time: 

• Visiting Tutor-Opening University (1999-2004)
• Visiting Instructor – IWE, University of Colombo (2005-2006)
• Visiting Lecturer – NILIS, University of Colombo (2006-2007)
• Trainer –Delivering Continuous Professional Development courses for Teachers, under the Connecting Classrooms project – British Council

Abstracts (Peer Reviewed)

• Sudusinghe, WS; Rajapaksha, RMNP; Kumara, WGC (2021) Assessing the Students’ Perception on the Effectiveness of Using Padlet in English Language Learning, Rajarata University International Symposium On English Language Teaching (RUISELT-2021)
• Gunawardena, R. A, Rajapakse, R.M. N. P., (2020). Factors affecting the performance of students’ writing in English. GARI Multidisciplinary Research Symposium 2020. Global Academic Research Institute. Global Academic Research Institute | GARI Conference
• Rajapakse, N. P. (2019). A study of the need to conduct a pre-sessional academic English course for English medium postgraduate students, Proceedings of 4^th Annual Research Conference – Eastern University, p.24. 
• Rajapakse, N. P. (2016). Heterogeneity in the classroom minimizes English language learning-teaching process, Proceedings of International Conference on Social Science, Arts and Education – New York, p.13.
• Rajapakse, N. P. (2014). Maximum learning outcomes by effective teaching, International Conference on Contemporary Practices in Language, Literature and Education – Gujrat, p.47.

Theses Supervised

• De Silva, J.P.C.J. (2019). Non-completion of the postgraduate degree programme awarded by SLN (Unpublished master’s thesis). Defence Services Command and Staff College, Sapugaskanda.
• Dharmawardhana, V.S.K. (2018). Need of a career development programme for middle regiment officers and its effects on Sri Lanka Air Force (Unpublished master’s thesis). Defence Services Command and Staff College, Sapugaskanda.
• Gunawardhane, R.A.J.G. (2015). Improving English Proficiency through Sri Lankan Education System (Unpublished master’s thesis). Defence Services Command and Staff College, Sapugaskanda.
• Weeratunga, T.W.D.D. (2018). Low educational level of society has direct axis to increase the crime rate in Sri Lanka (Unpublished master’s thesis). Defence Services Command and Staff College, Sapugaskanda.