We report data from the first year of a three-year collaboration between a sport-based youth development program, Positive Coaching Alliance (PCA), and a university-based research institute. The theory of change of PCA was tested with youth athletes, representing multiple sport types (e.g., individual/team) and seasons (e.g., fall/winter), who completed self-report surveys indexing a key facet of positive youth development--character. Noting assets and challenges of such researcher-practitioner collaborations, we discuss the results of the first year of data derived from this collaboration and differences in their use to the researchers and practitioners. Using this collaboration as a sample case, we discuss implications for refining how developmental scientists can advance outreach scholarship, and specifically researcher-practitioner engagement, through the use of developmental theory and methodology.