Li Xing, also known as Li Jiu type, is an expert lecturer on nine personality types. She is the dean of Beijing Nine-Type Personality Development College and a special lecturer of Boren Education Center of Beijing Normal University. The books such as Theory of Nine Personality, How to Treat Nine Personality Correctly and Objectively, and Theory of Nine Personality's Interpersonal Relationship were all written by Mr. Li, who incorporated many experiential elements into the series of nine personality courses such as sand table simulation, sitcoms, movies and videos. Teacher Li's nine-type personality course has strong on-site affinity and interaction, active classroom atmosphere, humor and wit, flexible interaction and good listening effect.