Universal Design for Learning (UDL) is a framework for the teaching-learning transaction that conceptualizes knowledge through learner-centered foci emphasizing accessibility, collaboration, and community. Given the importance of access to achieving social justice, UDL is a promising approach to meeting all learners' needs more effectively. In this article, the history and philosophy of UDL are discussed and elaborated, followed by an explanation of how the principles of UDL were used to improve an existing online course offering for adult learners.