Wendy Wood, PhD, knows more about the science of habit formation - and habit breaking - than just about anyone.

While popular writers share their opinions about habits, Wood does the research. More than 30 years worth, as a research psychologist first at Duke University and now at the University of Southern California.

Wood has published over 100 peer-reviewed papers, and the paper trail of her research demonstrates a curious and creative and extremely tenacious approach to uncovering the mysteries of human behavior - particularly those human behaviors that are a mystery to the humans engaging in them.