Online education for K-12 students has grown rapidly over the past decade. Approximately four million K-12 students enroll in one or more online courses each year. Because online learning is expanding into K-12 settings, teacher education programs need to prepare preservice teachers to be successful in these areas. This paper describes the design and initial implementation of a graduate certificate program in online instruction developed to help pre- and in-service teachers gain these skillsets. In addition to overviewing courses required for this certificate, the paper describes how the program has attracted attention beyond the college of education to include students from multiple disciplines. These diverse voices enrich the exploration of online teaching among all learners.