The purpose of this study was to determine how teacher education programs may better prepare teacher candidates to teach in K-12 online learning environments. The primary research question addressed was: What specific knowledge, skills, and dispositions should teacher education programs include in their curriculum to better prepare teacher candidates to teach in K-12 online learning environments? To answer this question, the researcher employed a qualitative case study methodological approach in which the study's participant was observed for three months as he taught multiple sixth grade mathematics classes in a fully online learning environment. Findings from this study indicate that teacher education programs should offer field experiences in K-12 online learning environments and that teacher educators must learn, develop, and model the necessary knowledge, skills, and dispositions relevant to K-12 online learning environments. [This article was written with Michael J. Casale.]