Is there an Expert in the house?

My expert needs to have previously written a fiction or fantasy novel (preferably a fantasy novel). This novel must be able to maintain the attention of the audience and be enjoyable. I want to be able to learn from their practice of writing. to be able to develop the vast world that only exists within the realm of my mind and make others see it as well. The author must be alive as well so they can provide feedback (what is a mentor worth if they're dead right? Sorry Tolkien can't use you as a mentor.)