In March 1840 he took up duties as commandant of the penal settlement at Norfolk Island and applied his penal principles. Convicts were awarded 'marks' to encourage effort and thrift. Sentences were served in stages, each increasing in responsibility. Cruel punishments and degrading conditions were reduced, and convicts' sense of dignity was respected. Perhaps the fact that he had experienced the life of a prisoner himself played a part in his approach to his task. He was the only commandant with such an experience.