Greg Hartley knows human behavior in and out of the trenches from battlefield interrogations to the board room. A former US Army Interrogator, Interrogation Instructor, and Resistance to Interrogation Instructor, Greg has written ten books with Maryann Karinch on body language and behavior. He made a twenty-year successful climb of the corporate ladder culminating in a role as an operating partner in a Private Equity Investment firm.Greg has appeared on every major television network and has been featured by many national and international media outlets for radio, print, and Internet to analyze and explain the why behind what people are saying. He regularly contributes to network news and programs such as Dr Phil. He has appeared in four feature length TV programs dealing with human behavior on Discover, National Geographic, History Channel, and UKTV4 Greg is a founder of the popular YouTube channel "The Behavior Panel" with 860K subscribers and more than 120 million views. He is also a host of The Behavior Panel, the first weekly network TV show dedicated to body language and behavior and is constantly ranked in the top 4 body language experts in the world.