Cethosia cydippe kalii Tennent, 2015, photographed on the island of Kimuta, eastern Louisiades, Papua New Guinea
 
John Tennent (JT) served in the British Army between 1967 and 1991, mostly overseas. Whilst he was supposed to be working, he took part in, and often led, expeditions to places as far apart as Panama, Bermuda, the Himalayas and Borneo - where he climbed to the top of Mount Kinabalu in Sabah three times, on one occasion camping for several days just below the summit. In 1985 he was Deputy Field leader of a four-months phase of Project Wallace, an international year-long expedition to the Indonesian island of Sulawesi sponsored by the Royal Entomological Society of London and supported by the British Armed Services.
He resigned from the army in 1991 to pursue research into insects and the history of natural history in many parts of the world, usually on the path least travelled, and in 1996 led an Imperial College Expedition to climb to the summit of Mount Popomanaseu on Guadalcanal, Solomon Islands. For more than two decades he has been engaged in research into butterfly biogeography and systematics on islands of the southwest Pacific. During the course of research he travelled to several hundred islands, including all the major islands and dozens of small remote islands of the Solomons, Vanuatu and islands off the eastern coast of New Guinea (D'Entrecasteaux, Trobriands, Louisiades), as well as further east to less-visited Pacific islands including Wallis & Futuna and the Marquesas in French Polynesia.
He was awarded the British Empire Medal in the New Year's Honours List in 1981 and elected a Fellow of the Royal Entomological Society in 1982. Following retirement, he was elected a Fellow of the Linnean Society in 1995; made a Member of the Institute of Biology in 1998 and elected a Fellow of the Society in 2015. He gained a Master of Science degree in Biodiversity Management in 1998 and was invited to become a Scientific Associate at what was then the British Museum (Natural History), London (now re-named the Natural History Museum) the same year. He was awarded the Linnean society H H Bloomer medal for contributions to science in 2007 and made a Member of the Order of Logohu (Logohu means 'bird of paradise') in the Papua New Guinea New Year's honours list in 2015 for work on Pacific butterflies. He was invited to become an Honorary Associate of Oxford University Natural History Museum in 2017.
The author of more than 250 scientific papers and reviews, as well as several books on butterflies, an anthology of insects in poetry through the ages and a biography of famous naturalist Albert Stewart Meek, he has described some 180 new butterfly species and subspecies, many discovered by himself. Six hundred copies of a field guide to the butterflies of Vanuatu were supplied gratis to every school in Vanuatu.
Travel has always been of paramount importance; he has been in the field in numerous remote places, from the Canadian arctic, the East Sayan Mountains and the area north of Lake Baikal, to the deserts and Hoggar Mountains of southern Algeria, and the Pacific, often for several months at a time. He has been supported in these endeavours by grants from learned societies and museums, and from National Geographic, Washington. He has a wide variety of interests outside entomology, including poetry, music and photography.