[1] He was at first in the English Royal Navy, but later devoted himself to painting.

While settled in London, Jean painted portraits of many members of the British Royal Family, amongst them the portraits of George III, of the Queen Charlotte, of the Duke and Duchess of Gloucester and of their children.

Amongst other collections, his works belong to the Victoria and Albert Museum and Windsor Castle.

They had two children; Roger, who also became a miniaturist, and Anne Marthe.

Jean remarried after Anna's death, to Marie de Ste Croix (1763 Jersey - 1820, married 1788 in Saint Saviour, Jersey) and they had 4 children (Mary, Harriot, Philip and Henriette Elizabeth).