The Lamat Institute over the past decade has increased participants’ competitiveness for graduate programs and prepared them for the STEM workforce more broadly. Key components of the Institute include intensive research instruction through summer internships, a winter computational boot camp, academic counseling and mentoring, astronomy science workshops, and social justice discussions. In addition, a comprehensive mentoring professional development program is designed to encourage mentors and mentees to adopt an anti-racist, critical approach to mentoring relationships; unveil the unwritten rules of academia; and empower mentors and mentees to co-develop a transformative learning space that prepares and inspires mentees for graduate study.