Shelly Hagen is a freelance writer and the author of several books for Adams Media, including Body Language Basics. She holds an associate's degree in psychology and has extensive experience working with experts in the field of medicine and behavioral studies. She lives in Saratoga Springs, NY.

Technical Reviewer: David Givens, Ph.D., is the founder of The Center for Nonverbal Studies in Spokane, WA. Dr. Givens speaks regularly about body language and works as a consultant on the subject for companies like Wendy's, Best Buy, Epson, and Pfizer. The author of Love Signals and Crime Signals, he lives in Spokane, WA.