Joan Holub has authored and/or illustrated over 140 children’s books, including the Goddess Girls series, the Heroes in Training series, the New York Times bestselling picture book Mighty Dads (illustrated by James Dean), and Little Red Writing (illustrated by Melissa Sweet). She lives in North Carolina and is online at JoanHolub.com.

Suzanne Williams is the author of over fifty books for children, including the Goddess Girls series, the Heroes in Training series, and the award-winning picture book Library Lil (illustrated by Steven Kellogg). She lives outside Seattle, Washington, and is online at Suzanne-Williams.com.

Together, Joan and Suzanne write the Goddess Girls, Thunder Girls, Little Goddess Girls, Heroes in Training, and Grimmtastic Girls series.