Justinian Gantz, described in the East India Gazette as 'Miniature Painter', was the son of the artist John Gantz. In addition to their work as draughtsmen for the East India Company, they may have practised as architects and ran a family lithographic press in Popham's Broadway, Chennai (M. Archer, British Drawings in the India Office Library, 1969, I, p.49, and J.R. Abbey, Travel in Aquatint and Lithography, 1957, II, no.445). Seven watercolours by Justinian Gantz of European houses in Chennai dating from 1832-1841 are in the collection of the British Library.