Nothing is known of Green's origins; he is first documented in Philadelphia in the late 1750s, when he sat for a portrait drawing by Benjamin West.
[1] Green seems to have given up painting when his wife inherited a house from her stepmother;[1] the couple called it Verdmont, as a play of words on his own name.
[3][4][5] Consequently, his tenure in this position was widely reviled in the United States, and he was frequently insulted in the mainland press;[2][6] some of his decisions were overturned in London as well, though he was respected for his fairness by colonial governor George Beckwith.
[7] Green was also a gentleman farmer at Verdmont, producing eighty bales of cotton one year there.
[1] At his death, Green left an estate valued at £286, half of which consisted of three slaves, a cow, and a horse.