* _The Time Traveler's Wife_ (2003)
* _Shadowman_ (2010)
* _The Accidental Time Machine_ (2014)
Non-fiction:
* _The Yoga of Aging: A Guide for Baby Boomers_ (1995)
* _Getting the Most Out of Chiropractic Care: A Consumer's Guide_ (1997)
* _Your Child's Health: A Comprehensive Guide from Birth to Age 18_ (2001)
* _The Science of Dr. Who_ (2012)
* _Brain Power: Boost Your Brain Power and Memory and Keep Your Mind Sharp_ (2021)