What has the author Audrey Gellen Maas written?

It seems you might be thinking of Audrey Niffenegger, not Audrey Gellen Maas.

Audrey Niffenegger is a well-known author, and her most famous work is "The Time Traveler's Wife". She has also written:

* "Her Fearful Symmetry"

* "The Three Lives of Charlotte Gray"

* "A Life on the Edge" (a nonfiction book)

* "The Time Traveler's Almanac" (a collection of short stories)

Let me know if you were looking for a different author!