He excavated at various sites in the South West of England, including Arbor Low, Glastonbury Lake Village, Avebury, and Windmill Hill.
In 1888 he started working for the archaeologist Augustus Pitt Rivers and trained in archaeological techniques and later took over as his secretary.
[5] Florence took part in excavations and field walking with Gray, and also carried out post-excavation work at the museum in Taunton.
[1] After leaving Pitt-Rivers he led the excavations at Arbor Low in 1901 and 1902,[10] and then worked on the rings on Bodmin Moor.
One of Gray's contributions to archaeology was the scale of the excavations undertaken and the detailed records kept following the teaching of his mentor Pitt-Rivers.