Master hacker Christopher Hadnagy explains how to use social engineering to get the most out of your social interactions.

Christopher Hadnagy describes himself as a hacker, but not the kind who uses technical skills to break into computers; he's a hacker of humans.

Using psychological principles and social techniques, Hadnagy can convince people to let him into protected locations and give up secure information.

Fortunately, Hadnagy is one of the good guys; companies hire him to assess the weak points in their security protocols.

In Human Hacking, Hadnagy and co-author Seth Schulman teach us how to use human hacking techniques to maximize interactions in everyday life.

Human hacking, or social engineering, means getting what you want while also leaving people better off.

These techniques are applicable to situations like getting seat upgrades on flights, getting promoted at work, and resolving family difficulties.