Who designed the Twilight apple cover?

Stephenie Meyer has stated that the Apple on the cover represents the forbidden fruit from the book of Genesis. It symbolizes Bella and Edward's love, which is forbidden, similar to the fruit of the Tree Of knowledge, as is implied by the quote from Genesis 2:17 that is quoted at the beginning of the book. It also represents Bella's knowledge of what good and evil are, and the choice that she has in partaking of the "forbidden fruit", Edward, or choosing not to see him.