Questar III BOCES, situated in Castleton-on-Hudson, New York, serves as an educational backbone for 22 school districts across Rensselaer, Columbia, and Greene counties. This collaborative entity focuses on transforming lives and fulfilling dreams by fostering a culture immersed in excellence, leadership, service, and innovation. Offering a diverse range of educational activities such as career and technical education (CTE), New Visions programs, and special education, Questar III prepares students for successful futures through hands-on training in agricultural, automotive technology, aviation, construction, and culinary arts.

The school is recognized for its innovative New Visions programs that create immersive experiences in business, healthcare, and STEM fields, developed through partnerships with local businesses and higher education institutions. Questar III not only equips students for the modern workforce but also provides essential administrative services like financial planning and grant writing to its associated districts. Distinguished by its accomplishments, such as becoming a High Schools That Work pilot site and the founding of Tech Valley High School, Questar III demonstrates a steadfast commitment to educational and community advancement. This commitment is further exemplified by its 'Leading Edge' framework, which accelerates the school's capability in a rapidly changing educational landscape.