William Mulcahy, is a licensed professional counselor and psychotherapist. He has served as supervisor at Family Service of Waukesha and as a counselor at Stillwaters Cancer Support Center in Wisconsin specializing in grief and cancer-related issues, and he has worked with children with special needs. Currently he works in private practice in Pewaukee, Wisconsin, and he is the owner of Kids Cope Now, a program for providing books and tools to help kids in the hospital. Bill's picture books include Zach Apologizes, Zach Gets Frustrated, and Zoey Goes to the Hospital. He lives with his wife, Melissa, his three children, and his three stepchildren in Wisconsin, where life is never boring.Darren McKee has illustrated books for many publishers over his twenty-year career. When not working, he spends his time riding his bike, reading, drawing, and traveling. He lives in Dallas, Texas, with his wife Debbie.
"For young Zach, a class field trip to the museum is about more than cool exhibits--it is also about learning from mistakes and dealing with embarrassment. His teacher helps him see that everyone makes mistakes--and how to use them to grow using an easy-to-remember tool, the Key to Mistakes. The latest addition to author William Mulcahy's outstanding Zach Rules series for boys and girls, Zach Makes Mistakes, is appropriate and highly recommended for elementary school and community library collections for young readers."--Midwest Book Review