Later he was appointed as the Chief Editor of the Sunday Observer in 2003. He has regularly contributed to the media on international relations and global issues for over four decades. De Silva translated the three volume Karl Marx's treatise on the socialist model, Das Kapital to Sinhala. He was proficient in both Sinhala and English and wrote books in both languages. He contributed to the panel of judges to select the best translations of the year at several literary festivals organized by the State Literary Advisory board.