[2] He became an associate of the Royal Institute of British Architects in 1956, eventually being elected as a fellow in 1958.
[6] Mortimer and de Giorgio had offices in Benghazi and Tripoli where they designed and built schools and hospitals.
[1] He rose in rankings to become a Knight Grand Cross of Magistral Grace in Obedience with Sash.
de Giorgio was the President of the Maltese Association of the Sovereign Military Order of Malta for 14 years between 1986 and 2000, during which time, among various projects undertaken he led the construction of the Malta Association's Headquarters at Casa Lanfreducci in Valletta.
De Giorgio also led the organising committee for the celebrations held in Malta to mark the 900th anniversary of the foundation of the order.