[4] He obtained a BA and MA in Architecture and Sanskrit at Trinity College, Cambridge before completing a postgraduate diploma at the Institute of Archaeology, University of London.
[4] At the institute, he qualified with distinction and was awarded the Gordon Childe Prize, as one of two best all-round students in all fields of archaeology.
In 1968, he joined the Archaeological Survey Department of Sri Lanka as the Assistant Commissioner in charge of scientific excavations.
[5] He outlined a revised age estimate for radio-carbon chronology of ancient Anuradhapura in a research paper which was presented at the 14th International Conference of the European Association of South Asian Archaeologists in 1997.
[6] Siran then focused on prehistoric explorations and excavations in ancient shore dunes (referred to as the Iranamadu Formation) dating back to more than 130,000 years ago.