This poster will present on TCLI’s almost 30 years of success in building a tribal college librarian-driven week-long professional development opportunity. The Tribal College Librarians Professional Development Institute (TCLI) is an educational initiative that has impacted Indigenous communities across the U.S., Canada and beyond, by enhancing the professional and cultural knowledge of librarians serving these communities; it has also enhanced the leadership and collaboration skills of the tribal college librarians, making them better able to serve the information needs of their communities. Serving in a dual role as both the academic library and the public library in their tribal communities, tribal college librarians from mostly geographically-isolated areas are able to come together face to face each year at TCLI to share their best practices, successes and challenges, with many of these librarians presenting the institute programming to their peers, a niche area of librarianship. Additional presenters are brought in each year, based on the needs and desires of the tribal college librarians for professional development and cultural programming requested via the TCLI listserv and via the annual institute evaluations. TCLI has become the professional development opportunity of choice for these librarians because of the valuable programming, and even more so, because of the face-to-face networking and group problem-solving they’re able to do through this institute. Since 2010, TCLI has been supported by IMLS in order to bring this niche group of librarians together annually.