Personality is not about what disorders you have but about who you are. It refers to a person's characteristic patterns of thought, feeling, behavior, motivation, defense, interpersonal functioning, and ways of experiencing self and others. All people have personalities and personality styles. While there are as many personalities as people, clinical knowledge accrued over generations has given rise to a taxonomy of familiar personality styles or types. Most people, whether healthy or troubled, fit somewhere in the taxonomy. Empirical research over the past two decades has confirmed the major personality types and their core features.1-5 Most clinical theorists do not view the personality types as inherently disordered. They are generally discussed in the clinical literature as personality types, styles, or syndromes-not "disorders." Each exists on a continuum of functioning from healthy to severely disturbed. The term "disorder" is best regarded as a linguistic convenience for clinicians, denoting a degree of extremity or rigidity that causes significant dysfunction, limitation, or suffering. One can have, for example, a narcissistic personality style without having narcissistic personality disorder. The same personality dynamics give rise to both strengths and weaknesses. A person with a healthy narcissistic personality style has the confidence to dream big dreams and pursue them; they can be visionaries, innovators, and founders. A person with a healthy obsessive-compulsive style excels in areas requiring precise, analytic thinking; they may be successful engineers, scientists, or academics. A person with a healthy paranoid style looks beneath the surface and sees what others miss; they may be investigative journalists or brilliant medical diagnosticians. Our best and worst qualities are often cut from the same psychological cloth"--