Born in Dublin in 1973, Oisín spent his childhood there and in Drogheda, County Louth. He started writing and illustrating stories in copybooks when he was about six or seven, setting himself on a path that would steer him well clear of ever obtaining of a proper job.
Despite his writing habit, he spent most of school convinced he was going to become a zoologist, an aspiration he lost after taking his first art exam in third year at St. Olivers Community College. Unable to conceive of a way to make a living from writing fiction after his Leaving Cert., he decided to fund his dreams of being an author by working as an illustrator. He signed up for a design and print foundation course in Ballyfermot Senior College, Dublin, in 1990 and then studied animation at Dun Laoghaire School of Art and Design.
In 1992 he dropped out of college to set himself up as a freelance illustrator/artist, serving the publishing and design industries. In 1997, he took up a position as Background Layout Designer for Fred Wolf films, working on the animated series of Zorro. After completing his contract, he decided to expand his horizons and left for London in February 1998 to seek his fortune. He found gainful employment as a security guard, watching over trains and then hospitals.
In January 1999, he joined the M&M Consultancy, a small advertising and design firm, as art director and soon expanded into copy writing. After three and a half years of working in advertising he became increasingly concerned for his immortal soul. He returned to Ireland in the summer of 2002 much as he had left - with no job, no home and some meagre savings. He set himself up as a freelance illustrator once more, before getting his first books published in 2003.
Oisin now works full-time as a writer and illustrator. He lives somewhere in the Irish countryside, where he won't be heard shouting at his computer.
Beyond the huge domed roof of Ash Harbour, a city built inside a hollowed-out mountain, deadly storms and Arctic temperatures have stripped the Earth bare. Resources are limited and access to power is all-important. Sinister bodies reign supreme, undercover operations are rife and every move is monitored by the Clockworkers and Dark-Day Fatalists. When sixteen-year-old Sol Wheat's father goes missing and is accused of murder, Sol sets out to find out why, and in doing so uncovers the harsh reality behind Ash Harbour.
"A cracking paced read from first to last page makes Small-Minded Giants a real page turner and well worth a read for the above age group, however, this book does include some violence and more grown up themes than are suitable for younger readers."
Nate Wildenstern's brother has been killed, and the finger is pointed at him... After nearly two years, eighteen-year-old Nate returns home to the family empire ruled by his father - the ruthless Wildenstern Patriarch. But Nate's life is soon shattered by his brother's death, and the Rules of Ascension, allowing the assassination of one male family member by another, means he's being blamed. He knows that he is not the murderer, but who is? With the aid of his troublesome sister-in-law, Daisy, and his cousin Gerald, he means to find out. But when the victims of the family's tyrannical regime choose the funeral to seek their revenge, they accidentally uncover the bodies of some ancient Wildenstern ancestors, one of whom bears a Patriarch's ring. The lives of Nate and his family are about to take a strange and horrifying turn...
"I can honestly say this book is unlike any I’ve ever read before. The plot is so bizarre and there is so much that writer Oisìn McGann packs into its 440 pages that it just shouldn’t work but it so does at such break neck speed that you’ll finish reading it long before you’re ready for the story to end."