Background: Research shows that people benefit from having an internally defined belief system and identity to guide their decision-making rather than depending exclusively on external authorities to make choices. Less is known about what types of developmental experiences facilitate progression toward self-authorship, which is a way of being where a person depends on their internally defined beliefs to make decisions and direct their future. Purpose: This study examined an experiential education setting and the influence the setting had on high school students' progression toward self-authorship. Methodology/Approach: We used Pizzolato's open-ended Experience Survey and semi-structured interviews to examine aspects of self-authorship in high school students attending a semester-long experiential education program. Findings/Conclusions: We found students returning from their semester-long program focused on decisions that had a greater impact on their personally defined, long-term identity rather than immediate decisions. In addition, students showed growth in the three domains of self-authorship--epistemological, interpersonal, and intrapersonal. The results could be attributed to the pedagogical approach of the experiential education program. Implications: Educators who seek to provide experiences that support self-authorship could implement developmentally effective practices situated in an experiential learning context.