Mr. Thilakasiri born in September, 1965 at Colombo who completed his primary education from Mullegama Maha Vidyalaya, and secondary education from the Vidyakara Vidyalaya, Maharagama, Subsequently, graduated from the Faculty of Agriculture, University of Peradeniaya in 1991, and he obtained his Mphil Degree in integrated water resource management from University of Peradeniya in 2013.
He served for the Agriculture School, Pelvahara as a contractual lecturer during 1994 - 1996 and joint Sri Lanka Agricultural Service in 1996. Then he started his carrier as a Lecturer in the Sri Lanka School of Agriculture, Wariyapola, later served for Sri Lanka School of Agriculture Kundasale from 2002 to 2011. In 2011 he got transferred to Rice Research and Development Institute Batalagoda as the In-charge of the Training centre.