Promoting racial and ethnic minority students' interest in science, technology, engineering, and mathematics (STEM) careers remains a primary workforce goal. To advance this goal, this study examined, through an ecological lens, 18 African American high school seniors' perceptions of their experiences related to their aspirations for STEM careers. All students were enrolled in STEM programs. Using a phenomenological approach to analyze the outcomes of focus group interviews, the authors identified themes at the ontogenic, microsystem, and macrosystem levels. Environmental factors, such as counseling, family expectations, and available resources, played a substantial role in influencing the students' interests, experiences, and perceptions in their pursuits of STEM careers. Implications highlight the importance of counselors in encouraging students of diverse backgrounds to pursue STEM courses and for policy makers to provide resources that support students' STEM goals. Future research is needed to examine the longitudinal effects of high school STEM programs on diverse populations.