He was born in Siġġiewi[1] and spent his early childhood in that locality until 1901, when his family moved to Tarxien.
His hypothesis formulated at this time, that the cave was originally divided by an ancient river is still considered as valid today.
A number of restoration and excavation campaigns were conducted at Ħaġar Qim, Mnajdra and Tarxien Temples while material uncovered following serendipitous discoveries was published.
Baldacchino retired from the Museum Department in 1955 and for a number of years worked at the University of Malta.
He died on 6 July 1974 and was buried at the Addolorata Cemetery in Paola, Malta, just eleven days short of his 80th.