Dr. Jill Stoddard is a recovered imposter. For years, she was convinced that the only reason she was accepted into a competitive grad school program was because her father knew the program director. Dr. Stoddard isn't alone in this: deep down, the majority of successful people question their professional legitimacy a good amount of the time.  Why do we do this, and how can we stop? Although she's in recovery, Dr. Stoddard still struggles with feelings of imposterism. She works through them with psychological flexibility, the ability to be present with all thoughts, emotions, physical sensations, and urges, fully and without defense, while making conscious, deliberate choices based on what deeply matters to a person. Essentially, we're not attempting to change the substance of the thoughts and feelings that naturally occur to us; instead, we change the way we to those thoughts and feelings, so we aren't caught up in constant battle to control them.  Throughout , Dr. Stoddard lays the groundwork for understanding the imposter phenomenon; she outlines the traps professionals often fall into regarding their imposter feelings, and provides actionable steps for cultivating psychological flexibility to be able to choose bold career moves despite self-doubt and imposterism.