He also writes under the pen name Catherine Sefton for older children, primarily ghost stories and mystery fiction. The work by Sefton most widely held in WorldCat libraries is the novel In a Blue Velvet Dress (1972).
Waddell was born in Belfast, Northern Ireland, and has lived most of his life in neighbouring County Down, in Newcastle.
As a child, he grew up with a fondness of animals and often told stories in a lively manner. This inspired him and "the love of story" stuck with Waddell ever since. He aspired at a young age to be a football player and signed for Fulham F.C. team; Waddell reflects that he scored a hat-trick on his debut in adult football but wound up as a goalkeeper.
When it became clear his future did not lie in professional football, Waddell turned to his other love and began to write (he would later combine the two in the Napper series of football-centred children's books). Originally, he wrote for adults; his first real success was a comic thriller, Otley, which was made into a film starring Tom Courtenay and Romy Schneider. After moving back to Northern Ireland in the late 1960s, he wrote books that reflected on the changing situation in his native land. Soon his love of storytelling would pull him into writing children's literature.
In 1972, he went into a church to stop some vandals and got caught up in an explosion in Donaghadee—an experience that took him years to overcome. As an author, nearly all of Waddell's stories are inspired by events or places in his life at the foot of the Mourne Mountains.[3] As he wryly claimed, "I've been blown up, buried alive and had cancer as an adult, and survived all these experiences, so I'm a very lucky man."
Waddell and Firth won the Kurt Maschler Award, AKA the Emil, for The Park in the Dark (Walker, 1989). From 1982 to 1999, the award annually recognised one British "work of imagination for children, in which text and illustration are integrated so that each enhances and balances the other."[4]
