Diana Wynne Jones is a definite favorite fantasy author of mine from way back. After reading Charmed Life and Dog's Body in high school, I lost track of her other works. However, she is credited for writing Howl's Moving Castle, which was made into an animated movie. Luckily, I was able to read the book prior to the movie premiere. Despite Mrs. Jones' works are considered to be of the "young adult" genre, I still enjoy them.
Piers Anthony was quite a discovery, too. The Xanth series kept me going back for more. I suppose I have a dry sense of humor, for I loved his play on words. He's also credited for writing Total Recall, which was a surprise to me to discover at the time.