[3][4][5] He was educated at Royal College, Colombo, and University of Ceylon (Peradeniya), where he was a contemporary of Felix Dias Bandaranaike.
Whilst studying law, de Silva joined Associated Newspapers of Ceylon Limited, popularly known as Lake House, in 1954 as a part-time parliamentary reporter.
[3] He became a permanent member of staff at Lake House in 1960 and in 1965 he was appointed deputy editor of The Observer.
[3] De Silva founded the Lanka Guardian journal in May 1978 which he continued to edit until his death.
[3] During his tenure at the Lake House, Mervyn worked alongside the likes of Willie de Alwis,[8][9] Premil Ratnayake,[10] D. B. Dhanapala[11] and Christie Seneviratne.