Eustace Boucas was born in 1870 in Athens, Greece.
The present Eustace Boucas is not related to the namesake brother of Geo Boucas.
From the beginning of the twentieth century until the beginning of the First World War he held the 'American Photographic Studio of Artistsic Enlargements' at 54-56 Stadiou Street. After 1915 he advertised his studio at 53 Stadiou Street, and later at 47a, 47 and 51 Stadiou Street (as the numbers were changing).