Travis Langley, PhD, is a psychology professor at Henderson State University, the author of Batman and Psychology (Wiley), and the volume editor of The Walking Dead Psychology and Star Wars Psychology (both Sterling). He speaks regularly on media and heroism at universities, conferences, and popular-culture conventions including San Diego Comic-Con, New York Comic Con, and Wizard World conventions throughout the world. Necessary Evil: Super-Villains of DC Comics and other films have featured him as an expert interviewee, and the documentary Legends of the Knight spotlighted how he uses fiction to teach real psychology. Psychology Today carries his blog "Beyond Heroes and Villains," and he is one of the 10 most popular psychologists on Twitter with over 100,000 followers: @superherologist.