The purpose of this paper is to explore a teacher professional development program embedded in a networked learning environment, and to offer an emerging model and analytic matrix of 21st century teacher professional development. The Globaloria program is based on theories of learning by design and facilitates teachers and students as they create educational computer games connected to core curriculum. We situate Globaloria in existing teacher professional development research, and then provide a new analytical framework designed to explore data from an embedded networked professional learning environment. Our analyses point the way for new models of 21st century teacher professional development, and we believe it is helpful for the field of teacher education innovation in general. (Contains 1 note, 4 tables, and 1 figure.)