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. 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. In this book, she outlines the traps professionals often fall into regarding their imposter feelings, and provides actionable steps for cultivating psychological flexibility.