His first post was that of Sub-Editor with The Times of Malta in 1970 and was subsequently transferred to The Sunday Times of Malta a year later. Terence went freelance in 1973 and was Libya stringer for The Sunday Times (of London) and Le Figaro.
Mirabelli has also written for The Financial Times, ITN, CBS News, History Today and Interavia, among other notable titles.
In 1976, Terence was appointed Roving Correspondent of The Middle East in London and a year later he was promoted to the post of News Editor.The next few years saw Terence appointed Editor of Middle East Travel (1978) and Editor of Middle East Shipping and Transport (1979).
In 1984 Mirabelli founded Arab Traveller in Bahrain, and two years later he went freelance, returning to Malta in 1988 to co-found Island Publications Limited.
In March 1992 Terence was appointed Business Editor of The Malta Independent, and he also held the role of part-time Public Relations Consultant at the National Tourism Organization Malta from March 1993 to February 1994.
Island Publications, meanwhile, published Island Travel Trader from 1988 until 2017, the Island Travel Yearbook from 1989 to 2012 and the Malta Hotels Directory since 1999.