This is tough... Since, The Lord of The Rings trilogy and the Hobbit are my favorite books, I have to give it to J.R.R. Tolkein even if his follow-ups on the trilogy (the two histories and the other one) are unbearably boring. Actually! I'll make it a tie. R.C. Sproul has such an incredible mind, and really did change my life via "The Essential Truths of the Christian Faith". So...
i only like a few books and even though im 13(turning 14) i still like reading the just! series which are made up of just stupid,just shocking,just crazy,just disgusting,just annoying and just tricking so i would have to say andy griffiths would be my favourite author and terry denton is a great cartoonist but yeah i dont mind scott monk either as an author