This qualitative case study evaluated an instructor’s practices and decision making in the online course, Seminar in Teaching Geometry. The focus of the data analysis was to understand and evaluate the instructor’s decisions as they were influenced by the association of belief dimensions and learning-centered orientations. The results were coded based on my interpretation of the framework presented by Samuelowicz and Bain (2001). This framework explains that there are nine belief dimensions and four learning-centered orientations. The data collection involved one case (the instructor), examining the relationship between this instructor’s decision making, class activities, and responses from two students. At the conclusion of the study I presented a model that detailed the findings of this instructor and this online mathematics education course. The model identifies belief dimensions and learning-centered orientations associated with this online mathematics education course. This model will help educators, institutional administration, and students understand the dynamics of an online environment, in hopes of enhancing the experiences for the students and the instructors.