The authors work with 22 educators from a variety of disciplines during a 3-year time span to understand what authentic teaching means and to explore how authenticity is manifested in practice. Using a grounded theory approach, the authors interview participants twice per year, observe their classes, and hold focus groups at the end of the project. Data interpretation reveals five dimensions of authenticity: self-awareness, awareness of others, relationships with learners, awareness of context, and a critically reflective approach to practice. Following grounded theory guidelines, the authors develop a model that incorporates the categories generated from the data and generate tentative hypotheses about practice.