It's very odd that there's no listing for him in the "Something About the Author" encyclopedia series, and when I looked in "Biography in Context," all I found were a few magazine articles - no biographies of him.
Assuming the books listed at Wikipedia are by the same man, that is! Leaving aside the Dr. Who books, there are well over 130! Including maybe as many as two dozen mysteries - and horror stories involving vampires and werewolves. Plus - I find this
incredible - stories, beginning in 1984, about a dog named Goliath and his owner, a boy named David! (That's right, not Davey.) It turns out the dog is a golden retriever, unlike the other Goliath, which suggests there's no official connection between
that book series and the American clay-animated Lutheran TV series (1961-2004).