Gregory Hartley started his career with the U.S. Army, teaching interrogation and resistance to interrogation, as well as providing interrogation support to Special Forces in Operations Desert Shield and Desert Storm. He then translated that military experience to businesses and has provided body language and behaviorial analysis for print, TV, and radio media. With Maryann Karinch, Hartley is the author of five other books about human behavior, deception and body language, including How to Spot a Liar, I Can Read You Like a Book, and Get People to Do What You Want.

Maryann Karinch is the author of 15 books, many of which address human behavior. Her corporate background includes senior communications positions with a variety of technology companies.