Moving to London in 1848, he was introduced by David William Mitchell, an amateur illustrator himself and a secretary of the Zoological Society of London, to Trübner of Longmans publishing and the very next day was set to work on Gray's The Genera of Birds.
Berpindah ke London pada 1848, ia diperkenalkan oleh David William Mitchell, seorang ilustrator amatir dan sekretaris Zoological Society of London, kepada Trübner dari Longmans publishing dan pada hari berikutnya mengerjakan The Genera of Birds karya Gray.