This qualitative study investigates the lasting impact of early childhood experiences and Social-Emotional Learning (SEL) on lifelong development and leadership effectiveness. Through in-depth interviews with industry leaders from diverse sectors—law, business, IT, film production, and education—the research explores how SEL attributes cultivated in formative years contribute to essential leadership skills. Participants were selected using specific criteria to ensure a broad range of perspectives and experiences. Methodological rigor was ensured through triangulation and member checking to enhance validity and reliability of the findings. The primary objective is to examine the critical link between early childhood experiences, SEL, and leadership excellence sustained over time. A detailed methodological description, including participant selection criteria and an interview guide, is provided to ensure transparency and replicability. The findings are analyzed within broader theoretical frameworks and compared with existing

literature, illustrating how they confirm, challenge, or expand prior research. Practical recommendations for educators, policymakers, and organizations are offered, emphasizing the importance of early experiences and SEL in fostering lifelong leadership development. This study contributes valuable insights and suggests directions for future research to further build on these findings.