Senior Lecturer Gr I, Department of Pharmacy, (2007 – to date)
Head, Dept. Of Pharmacy (2008-2010)
Dean, Faculty of Allied Health Sciences (Feb. 2010 – to date)
Faculty Board Member, Faculty of Applied Sciences, Sabaragamuwa University of Sri Lanka, Belihuloya(2007 – to date)
Chief Editor, Sri Lanka Bulletin of Nursing and Allied Sciences, Faculty of Allied Health Sciences, University of Peradeniya (2009 – to date)
Senior Lecturer Gr I, Associate professor in Chemistry, Head of the Department of Physical Sciences, Dean of the Faculty of Applied Sciences, Acting Vice Chancellor for six months at Sabaragamuwa University of Sri Lanka (1998-2007)
Visiting lecturer in Chemistry Department of Chemistry University of Peradeniya(1999)
Visiting lecturer in Chemistry B. Sc. Programme in Military Science Sri Lanka Military Academy Diyathalawa(2001- to date)
Visiting lecturer in Chemistry South Eastern University, Samanturai(2000-2001)
Visiting lecturer in Chemistry Institute of Chemistry, Ceylon (2002-2004)
Triptolide derivatives useful in the treatment of autoimmune diseases, Michel J. Jung, D. B. Mahinda Wickramaratne and Michael Happerle, United States Patent, 6,004,999, Dec. 21, 1999
Gleinene and gleinadiana, 5,7-dimethoxycoumarins from Murraya gleniei root, V.Kumar, J. Reisch, D. B. M. Wickramaratne, R. A. Hussain, K. S. Adesina, and S.Balasubramaniam, Phytochemistry, 1987, 26, 511.
A synthesis of trans-β-farnesene from myrcene which includes a modified work up method for DIBAH reduction of esters to Aldehydes, P. Baeckstrom, L. Li, D. B. M. Wickramaratne, and T. Norin, Synth. Commun., 1990, 20, 423.
13C NMR Spectra of some 8-substituted 7-methoxycoumarins and 5,7-dimethoxy coumarins, M. I. M. Wazeer, V. Kumar, and D. B. M. Wickramaratne, Can. J. Spectrosc., 1990, 35, 3 ,57.
Structure and Biological activity of Tricolorin A, Major phytogrowth inhibitor from Ipomoea tricolor, R. Pereda-Miranda, R. Mata, A. L. Anaya, J. M. Pezzuto, D. B. M. Wickramaratne and A. D. Kinghorn, Proc. Am. Soc. Pharmacognosy, 33, P-7, 1992.
Cordell, G.A., Beecher, C.W.W., Farnsworth, N.R., Kinghorn, A.D., Pezzuto, J.M., Chai, H., Constant, H., Likhitwitayawuid, K., Shieh, H.L., Wickramaratne, D.B.M.. "Recent studies on biologically active natural products" New Trends in Natural Products Chemistry 57 - 78, 1998