Andy Weir is an author most famous for his book The Martian and his short story The Egg. He is also the author of the Ready Player One fanfic Lacero. This fanfic epilogue has been confirmed as canon by Ernest Cline and is included in newer editions of the book.
There is a huge coincidence between Andy Weir and Ernest Clein in the fact that Andy Weir has written the story The Egg and the book Artemis, which are both seemingly references to Ready Player One.