In 1765 he migrated to London .
In 1765 he began work as a mezzotint engraver , having taught himself the technicalities of this art , and quickly rose to a position in absolutely the front rank of British engravers .
In 1765 he migrated to London and began work as a mezzotint engraver , having taught himself the technicalities of this art , and quickly rose to a position in absolutely the front rank of British engravers .