He is currently a professor and the head of the Department of Prasutitantra and Kaumarabrithya (Ayurvedic Obstetrics and Pediatrics) of Institute of Indigenous Medicine, University of Colombo.

[1] Amarasinghe was born and raised in Alawwa, a rural area in Kurunegala District.

He then attended to Benaras Hindu University for the degree of Doctor of Medicine which he obtained in 1987.

He obtained his degree of Doctor of Philosophy from the Benaras Hindu University in 1997.

[3][4] He is also the current editor-in-chief of the Sri Lankan Journal of Indigenous Medicine (SLJIM).