Beyond for-credit offerings, some library and information science (LIS) schools are exploring MOOCs as a means to promote lifelong learning and professional development. Using web surveys and descriptive content analysis methods, this paper empirically addresses if, in LIS programs, MOOCs can fill a role and serve new populations of learners within large-scale learning environments. To do so, the authors use a MOOC they designed, built, and instructed as a test bed. Findings reveal that students did use the MOOC for professional development, that they expanded their knowledge and applied concept models learned in the course, and benefited from diverse viewpoints provided by the global community of learners. In addition to other findings, the research reveals that the authors' MOOC model was successful and there is significant opportunity for LIS programs to serve the profession through large-scale professional development learning environments like MOOCs.