Kristen Lavallee, PhD, co-author of What to Do When You Don't Want to Be Apart, is a developmental and school psychologist, and has worked with children in the U.S. and Switzerland. She has coauthored empirical studies and a book chapter on treatment for separation anxiety, and is managing editor of the scientific journal European Psychologist. She lives with her family in Providence, RI.

Silvia Schneider, Dr. rer. nat., co-author of What to Do When You Don't Want to Be Apart, is a professor of child clinical psychology at Ruhr-University Bochum, Germany. She has conducted several studies on childhood separation anxiety disorder (SAD), and authored a treatment manual in German for SAD.

Janet McDonnell's illustrations combine traditional media and digital techniques. In addition to illustrating books, magazines, and puzzles, Janet has both taught and written for children from preschool to high school ages. She is the illustrator of numerous books for children including Bye Bye Pesky Fly, What to Do When You Don't Want to Be Apart, and Blossom Plays Possum. Visit www.janetmcdonnell.com and follow Facebook: @janetmcdonnell.illustrator Twitter: @dcdonnelldoodle Instagram: @janetmcdonnellillo.