The purpose of this study was to understand the ways in which undergraduates grew and developed through participation in a holistic peer-mentoring experience. Twenty-two patterns of protégé growth emerged from the analysis of the data, which were organized conceptually into six overarching, emergent themes of protégé development: academic skills and knowledge, career decision-making, connectedness to others, maturity, physical wellbeing, and aspiration. The authors argue that the very high rates of protégé growth within the themes of academics, social connectedness, and maturity raise the possibility that growth in these thematic dimensions may be synergistic and mutually reinforcing.