David J O'Brien was born and raised in Dun Laoghaire, Ireland. He studied environmental biology and later studied deer biology for his PhD, at University College Dublin. Instead of pursuing his life-long interest in wolves and predator-prey interactions, after completing his doctorate, he taught English in Madrid, Spain, for four years while his girlfriend finished her doctorate in molecular biology. They married and moved to Boston, USA, so his wife could pursue her career and David decided that teaching was a vocation he was happy to continue. After seven great years teaching Biology at Boston's Cathedral High School and Zoology at Bridgewater State College, he returned to Spain three years ago so his wife could set up her new research group in her hometown of Pamplona shortly before their daughter was born. He currently teaches English and science in Pamplona, while looking after his daughter and writing.
David has loved writing since his teens. He began with poetry and had one of his first poems published in Cadenza, a small Dublin poetry magazine at the age of fourteen. Since then several more have been published in journals and anthologies such as Albatross, The Tennessee State Poetry League, Poems of Nature and various anthologies of Forward Press imprint in Britain. He began writing fiction soon after and wrote the novella that would later become Leaving The Pack at the age of seventeen. Though his academic writing took precedence for a number of years, and he is still involved in deer biology and management, he kept writing other things in his spare time and has always dreamt of one day being able to do it full time. While living in Madrid, he wrote some non-fiction articles for the magazine Hot English and while in Boston for the newspaper Dig.
An avid wildlife enthusiast and ecologist, much of David's non-academic writing, especially poetry, is inspired by wildlife and science, and he sometimes seeks to describe the science behind the supernatural. He has written a little bit of everything: to date a four-act play, a six-episode sit-com, various short stories and five more novels.
His Young Adult paranormal novel The Soul of Adam Short will be published in 2015 and a novella under the pseudonym JD Martins was published in January.
David is currently working on sequels to Leaving the Pack and an Ecological Fiction novel set in Scotland called The Ecology of Lonesomeness, He is also plugging away at a long novel set in the pre-Columbian Caribbean, and a non-fiction book about the sociology of hunting.