This study applied Bandura's model of reciprocal determinism through social cognitive theory to examine the bidirectional triadic relationships between personal, behavioral, and environmental factors that impact the underrepresentation of Black people, Indigenous people, and people of color (BIPOC) professionals in the nonprofit sector. Additionally, a critical race theory lens examined how White dominant culture holds the standard for the systems of power that influence norms, attitudes, and practices within the nonprofit sector. The goals of the study aimed to identify barriers to implementing BIPOC leadership development programs, provide insight into the current leadership development practices on the underrepresentation of BIPOC professionals, and suggest possible solutions for eliminating barriers and improving the leadership trajectory for nonprofit professionals. A qualitative research approach used semi-structured interviews to address the problem of practice. An open and axial coding process guided a thematic analysis using responses from open-ended. The interview participants' experiences and opinions from their leadership journeys helped construct the recommendations. The results show the barriers to effective leadership development and the components that influence career trajectory for BIPOC professionals in the nonprofit sector. The suggested recommendations include: utilize an integrated leadership development system to design BIPOC-centered mentoring and coaching opportunities; implement experience-based learning opportunities for emerging nonprofit leaders; ensure equitable access to funding and opportunities and practices; and foster a commitment to collective leadership for change. The integrated leadership development system and collective leadership framework will address the underrepresentation of BIPOC professionals and build strong collaborations among nonprofit leaders, organizations, and funding institutions. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://bibliotheek.ehb.be:2222/en-US/products/dissertations/individuals.shtml.]