Professor Tennekoon is an erudite scholar, a marvelous researcher and an academic of the highest caliber. She began her research career in the field of reproductive physiology and extended her research focus into molecular genetics of cancer, mitochondrial DNA and ancient DNA, population genetics, natural product development, and identification of biomarkers for hepatocellular carcinoma. She has supervised numerous Master and Doctoral students and authored nearly 80 publications published in international peer reviewed journals. Her excellence in research was duly recognized Prof. Tennekoon receiving the presidential research awards in the years 2001, 2005, 2010, 2012, 2015 and 2016, merit awards for scientific excellence in 2011, 2013 and 2014, SUSRED award in 2016 by the National Science Foundation of Sri Lanka (NSF) and the Senate awards for research excellence in 2016, 2017, 2018, 2019. She has also received several research grants from national and international funding agencies.