Having served in the First World War, Guy assisted with the excavations at Carchemish in Syria and El Amarna in Egypt.
In 1922, he was appointed Chief Inspector of Antiquities in Palestine and began an association with the Holy Land that would last the rest of his life.
He innovated the use of balloon photography in archaeology during his excavations at Megiddo.
He returned to the British Army during the Second World War, being promoted to lieutenant colonel and serving as a military governor.
[1][2][3][4] In 1925, Guy married Yemima, the eldest daughter of Eliezer Ben Yehuda, a lexicographer and Zionist responsible in large part for the revival of Hebrew.