La sua famiglia si trasferì abbastanza presto a Londra dove Gray cominciò a studiare biologia a 16 anni. Divenne l'assistente di suo padre quando questo redasse The Natural Arrangement of British Plants (1821). Dopo essere stato rifiutato dalla Linnean Society di Londra, abbandonò la botanica per dedicarsi alla zoologia. Dal 1824, iniziò a lavorare nel dipartimento di zoologia del Museo di storia naturale di Londra dove aiuta John George Children alla redazione del catalogo delle collezioni di rettili. Nel 1840, sostituì Children al posto di conservatore di questo dipartimento, funzione che occuperà fino al Natale del 1874.
Pubblicò parecchi cataloghi delle collezioni del museo di storia naturale nei quali analizzò i gruppi animali ma descrisse anche nuove specie. Partecipò attivamente all'arricchimento delle collezioni di zoologia del museo tanto da farlo diventare tra più importanti del mondo. Si stima che un milione di esempi supplementari viene ad aggiungersi alle collezioni durante la direzione di Gray.
Le sue innumerevoli pubblicazioni, circa 1200, mancano di uno studio sistematico e critico. Nel 1832, divenne membro della Royal Society.
Gray si interessò anche alla filatelia. Il primo maggio del 1840, quando il primo Penny Black fu messo in vendita, ne acquistò parecchi esemplari, diventando così il primo filatelico del mondo. Sembra che sia stato uno dei primi a proporre un tasso di affrancamento uniforme per gli invii postali, preparando così l'ideazione del francobollo.
Il colonnello William Henry Sykes (1790-1872) gli dedicò in suo onore l'Ardeola grayii della famiglia degli aironi.
1821 : A natural arrangement of Mollusca, according to their internal structure. London Medical Repository 15: 229–239.
1824 : A revision of the family Equidae. Zool. J. Lond. 1: 241-248 pl. 9
1824 : On the natural arrangement of the pulmonobranchous Mollusca. The Annals of Philosophy, new series 8: 107–109.
1825 : An outline of an attempt at the disposition of the Mammalia into tribes and families with a list of the genera apparently appertaining to each tribe. Ann. Philos. (ns) 10: 337-344
1825 : A list and description of some species of shells not taken notice of by Lamarck. Annals of Philosophy 25: 134-140, 407-415.
1826 : Vertebrata. Mammalia. (Appendix B in part). p. 412-415 in King, P. P. (ed.) Narrative of a Survey of the Intertropical and Western Coasts of Australia. Performed between the years 1818 and 1822. With an Appendix, containing various subjects relating to hydrography and natural history. Londres: J. Murray Vol. 2
1827 : Synopsis of the species of the class Mammalia. p. 1-391 in Baron Cuvier The Animal Kingdom Arranged in Conformity with its Organization, by the Baron (G) Cuvier, with additional descriptions. by Edward Griffith. and others. (16 vols: 1827-1835). London: George B. Whittaker Vol. 5
1828 : Spicilegia Zoologica, or original figures and short systematic descriptions of new and unfigured animals. Pt 1. Londres: Treuttel, Würtz & Co.
1829 : An attempt to improve the natural arrangement of the genera of bat, from actual examination; with some observations on the development of their wings. Philos. Mag. (ns) 6: 28-36
1830 : A synopsis of the species of the class Reptilia. pp 1–110 in Griffith, E. The animal kingdom arranged in conformity with its organisation by the Baron Cuvier. London: Whitaker and Treacher and Co. 9: 481 + 110 p.
1830-1835 : Illustrations of Indian zoology; chiefly selected from the collection of Major-General Hardwicke, F.R.S... 20 parties en 2 volumes. Illus. Indian Zool.
1831 : Description of twelve new genera of fish, discovered by Gen. Hardwicke, in India, the greater part in the British Museum. Zool. Misc.
1831 : Descriptions of some new genera and species of bats. pp. 37–38 in Gray, J.E. (ed.) The Zoological Miscellany. Pt 1. Londres: Treuttel, Würtz & Co.
1832 : Characters of a new genus of Mammalia, and of a new genus and two new species of lizards, from New Holland. Proc. Zool. Soc. Lond. 1832: 39-40.
1834 : Characters of a new species of bat (Rhinolophus, Geoffr.) from New Holland. Proceedings of the Zoological Society of London 1834: 52-53.
1834 : Characters of new species of land and freshwater shells regarded as hitherto undescribed. Proceedings of the Zoological Society of London 1834: 63–68.
1837 : Description of some new or little known Mammalia, principally in the British Museum Collection. Mag. Nat. Hist. (ns) 1: 577-587
1838 : A revision of the genera of bats (Vespertilionidae), and the description of some new genera and species. Mag. Zool. Bot. 2: 483-505
1839 : Descriptions of some Mammalia discovered in Cuba by W. S. MacLeay, Esq. With some account of their habits, extracted from Mr. MacLeay's notes. Ann. Nat. Hist. 4: 1-7 pl. 1
1841 : Contributions towards the geographical distribution of the Mammalia in Australia, with notes on some recently discovered species, in a letter addressed to the Author. Appendix C. pp. 397–414 in Grey, G. Journals of Two Expeditions of Discovery in North-west and Western Australia During the Years 1837, 38, and 39, Under the Authority of Her Majesty's Government. Describing many newly discovered, important, and fertile districts, with observations on the moral and physical condition of the aboriginal inhabitants, &c. &c. Londres: T. & W. Boone Vol. 2 vii 482 pp.
1841 : A catalogue of the species of reptiles and amphibia hitherto described as... Annals and Magazine of Natural History. (4) 8: 117-118.
1842 : Descriptions of some new genera and fifty unrecorded species of Mammalia. Ann. Mag. Nat. Hist. 10: 255-267
1843 : List of the specimens of Mammalia in the collection of the British Museum. Londres: British Museum xxviii + 216 p.
1843 : Shells. In E. Dieffenbach, Travels in New Zealand, with contributions to the geography, geology, botany and natural history of that country. 2, 396 p. Murray: Londres.
1844 : The seals of the Southern Hemisphere. pp. 1–8, 14-17 pls 1-10 in Richardson, J. & Gray, J.E. (eds) The Zoology of the Voyage of H.M.S. Erebus and Terror, under the Command of Captain Sir James Clark Ross, R.N., F.R.S., during the years 1839 to 1843, Volume 1 Mammalia, Birds. Londres: E. W. Janson
1844 : The seals of the southern hemisphere. pp. 1–8 pls 1-10, 14-17 in Richardson, J. & Gray, J.E. (eds) The Zoology of the Voyage of H.M.S. Erebus and Terror, under the Command of Captain Sir James Clark Ross, R.N., F.R.S., during the years 1839 to 1843. Vol. 1 Mammalia, birds. Londres: E. W. Janson
1844 : Beasts. pp. pls 18-22, 25-29 in Richardson, J. & Gray, J.E. (1844-1875). (eds) The Zoology of the Voyage of H.M.S. Erebus & Terror, under the Command of Captain Sir James Clark Ross, R.N., F.R.S., during the years 1839 to 1843. Mammalia, birds. Londres: E. W. Janson Vol. 1
1845 : Description of some new Australian animals. pp. 405–411 pls 1-3 in Eyre, E.J. (1845) (ed.) Journals of Expeditions of Discovery into Central Australia, and Overland from Adelaide to King George's Sound, in the Years 1840-1; sent by the colonists of South Australia, with the sanction and support of the Government: including an account of the manners and customs of the Aborigines and the state of their relations with Europeans. Londres: T. & W. Boone Vol. 1
1846 : On the British Cetacea. Ann. Nat. Hist. 17: 82-85
1846 : On the cetaceous animals. pp. 13–53 in Richardson, J. & Gray, J.E. (eds) The Zoology of the Voyage of H.M.S. Erebus and Terror under the Command of Captain Sir James Clark Ross, R.N., F.R.S., during the years 1839 to 1843. Vol. 1 Mammalia, Birds 37 pls. Londres: E. W. Janson
1847 : Characters of six new genera of bats not hitherto distinguished. Proc. Zool. Soc. Lond. 1847: 14-16
1847 : Description of a new rat from South Australia. Proc. Zool. Soc. Lond. 1847: 5-6
1847 : A list of the genera of recent Mollusca, their synonymia and types. Proceedings of the Zoological Society of London 15: 129-219.
1850 : Catalogue of the Mollusca in the Collection of the British Museum II. II. Pteropoda : 1-45. E. Newman: Londres.
1850 : Figures of molluscous animals, selected from various authors. Vol. 4. 124 p.
1854 : Catalogue of fish collected and described by Laurence Theodore Gronow, now in the British Museum. London. Cat. Fish Gronow, p. i-vii + 1-196.
1855 : Catalogue of Pulmonata or air-breathing Mollusca in the collection of the British Museum. Part I. London: British Museum (Natural History). iv + 192 p.
1857 : Guide to the systematic distribution of Mollusca in the British Museum. Part I. British Museum, Londres. xii + 230 p.
1858 : On Charadella and Lichenella, new forms of polyzoa from Australia. Proceedings of the Zoological Society of London 26: 319-322.
1858 : List of species of Mammalia sent from the Aru Islands by Mr A. R. Wallace to the British Museum. Proc. Zool. Soc. Lond. 1858: 106-113 pls 63-64
1859 : On Charadella and Lichenella, new forms of polyzoa from Australia. The Annals and Magazine of Natural History, Ser. 3, 3: 150-154.
1862 : Notice of a new species of dolphin (Delphinus catalania), discovered in North Australia by Mr John Macgillivray. Proc. Zool. Soc. Lond. 1862: 143-145
1863 : Description of some new species of mammalia. Proc. Zool. Soc. Lond. 1862: 261-263 pls 33-35
1864 : Handbook of British Water-Weeds or Algae. R. Hardwicke, Londres. iv +123 p.
1864 : On the Cetacea which have been observed in the seas surrounding the British Islands. Proc. Zool. Soc. Lond. 1864: 195-248
1865 : Notes on the whales of the Cape. Proc. Zool. Soc. Lond. 1865: 357-359
1865 : Notice of a new species of Australian Sperm Whale (Catodon krefftii) in the Sydney Museum. Proc. Zool. Soc. Lond. 1865: 439-442
1866 : Catalogue of Seals and Whales in the British Museum. Londres: British Museum vii + 402 pp.
1866 : A revision of the genera of pteropine bats (Pteropidae), and the descriptions of some apparently undescribed species. Proc. Zool. Soc. Lond. 1866: 62-67
1866 : A revision of the genera of Rhinolophidae, or horseshoe bats. Proc. Zool. Soc. Lond. 1866: 81-83
1866 : Notes on the skulls of dolphins, or bottlenose whales, in the British Museum. Proc. Zool. Soc. Lond. 1866: 211-216
1866 : Notes on the skulls of sea-bears and sea-lions (Otariadae) in the British Museum. Ann. Mag. Nat. Hist. (3) 18: 228-237
1866 : Notes on some Mammalia from Port Albany (Cape York Peninsula), North Australia, with the descriptions of some new species. Proc. Zool. Soc. Lond. 1866: 219-221 pl. 25
1867 : Lithothrix, a new genus of Coralline. The Journal of Botany, British and Foreign 5: 33.
1867 : Notes on the variegated or yellow-tailed rats of Australasia. Proc. Zool. Soc. Lond. 1867: 597-600
1869 : Additional notes on Sea-Bears (Otariadae). Ann. Mag. Nat. Hist. (4) 4: 264-270
1870 : Observations on the Whales described in the 'Ostéographie' &c. Ann. Mag. Nat. Hist. (4) 6: 154-157
1870 : Notes on the skulls of the genus Orca in the British Museum, and notice of a specimen of the genus from the Seychelles: O. capensis. Proc. Zool. Soc. Lond. 1870: 70-77
1871 : Supplement to the Catalogue of Seals and Whales in the British Museum. Londres: British Museum xi 109 p.
1871 : Notes on the Berardius of New Zealand. Ann. Mag. Nat. Hist. (4) 8: 115-117
1871 : On Euchelymys a new genus and two new species of Australian freshwater tortoises. Annals and Magazine of Natural History. (4) 8: 117-118.
1872 : On the genus Chelymys and its allies from Australia. Proceedings of the Zoological Society of London, 1872: 504-514.
1872 : Notice of a new Netted Sponge (Meyerella) from the Philippines. Annals and Magazine of Natural History, (4) 10: 76.
1872 : On the Sea-Bear of New Zealand (Arctocephalus cinereus) and the North-Australian Sea-Bear (Gypsophoca tropicalis). Proc. Zool. Soc. Lond. 1872: 653-662
1873 : Remarks on some of the species in the foregoing paper [Hector, 1873]. Ann. Mag. Nat. Hist. (4) 11: 107-112
1873 : Notice of the skeleton of the New Zealand Right Whale (Macleayius australiensis) and other whales, and other New Zealand marine Mammalia. Proc. Zool. Soc. Lond. 1873: 129-145
1874 : Description of the skull of a new species of dolphin (Feresa attenuata). Ann. Mag. Nat. Hist. (4) 4: 238-239
1874 : Hand-list of Seals, Morses, Sea-lions, and Sea-bears in the British Museum. Londres: British Museum 44 pp. 30 pls
1875 : Feresa attenuata, sp. n. J. Mus. Godeffroy 8: *** Pages - No Details ***
1875 : Miscellanea. pp. 12a-12d in Richardson, J. & Gray, J.E. (1844-1875) (eds) The Zoology of the Voyage of H.M.S. Erebus & Terror, under the Command of Captain Sir James Clark Ross, R.N., F.R.S., during the years 1839 to 1843. Mammalia, birds. Londres: E. W. Janson Vol. 1
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