He was born in London in 1824 and after an apprenticeship there with a wood engraver, George Bonner, he began work in Paris, first as an engraver, then as a draughtsman on wood. In 1846 he went to the United States to illustrate a New York City paper, and remained there for about two years. During this time he obtained a commission from the government of the United States to design banknotes. His health compelled him to return to Europe, and he went to Italy.
Thomas resided in the boroughs of Kingston and Surbiton till illness caused his removal to Boulogne-sur-Mer, where he died on 21 July 1868. A collection of his works was exhibited in Bond Street in June 1869, and his sketches and studies were sold at Christie's in July 1872.
Thomas exhibited his first picture, St. Anthony's Day at Rome, at the British Institution in 1851. Garibaldi at Rome, painted from sketches made in 1849, was exhibited at the Royal Academy of Arts in 1854, and attracted much attention. His next picture was Ball at the Camp, Boulogne, 1856.
Thomas obtained the patronage of Queen Victoria, and painted the following pictures by her majesty's command:
Most of the illustration were reused without credits[1] in Uncle Tom's Cabin; or, Life Among the Lowly, A New Edition, With Illustrations, and a Bibliography of the Work by George Bullen, Together with an Introductory Account of the Work. Boston: Houghton, Mifflin and Co., 1888
Myles Birkett Foster, Household Song. Collection of lyrical pieces. With illustrations by B. Foster, G. H. Thomas, S. Palmer, etc., 1861
Gilbert Percy, Piccalilli: a mixture, (illustrations by George Housman Thomas & Thomas R. Macquoid, engraved by Edmund Evans), London, Sampson Low Son & Co., 1862
The Life and Adventures of Dr. Livingston: in the interior of South Africa... Illustrated with portrait, map, and sixty engravings, etc., Henry Gardiner Adams, William Harvey, F. G. Sargent, George Houseman Thomas, J. Blackwood & Co., 1868
Wilkie Collins, Armadale, in Cornhill Magazine, November 1864 - June 1866....