GWENDOLYN MITCHELL DIAZ began life as a missionary kid in Nigeria. Her family moved to the United States when she was ten. A graduate of the University of Pennsylvania, she spent many years working in the medical profession, but found time to write magazine articles and newspaper columns about sports, family, and her faith in God. She has published several books for Moms (including The Adventures of Mighty Mom) as well as three books for teenagers dealing with the issues they face. Sticking Up For What I Believe is the first in this trilogy.

As the mother of four boys, Gwen feels particularly passionate about helping teens solidify their faith and grow as Christians. She and her husband Ed want to present Christianity to teens in a way that "captures their interest, satisfies their curiosity, and communicates God's exciting truths."