William Roberts, Dictionary of National Biography… (1912)
“ Grego, who was always ready to lend prints and drawings for public exhibitions, occupied much of his time in organising exhibitions, chiefly of 'English Humorists in Art.' He was himself facile with his pencil, doing much work as a designer of theatrical costumes, and etching the designs of others. He invented a system of reproducing eighteenth-century colour prints in such exact facsimile that they have often been mistaken for originals. ”
