This document discusses the history and development of e-learning and online professional development (e-PD) for educators. It traces the origins of distance education back to the 18th century and highlights universities like the University of London that began offering distance learning degrees in the 1800s. The development of the internet allowed for the rise of the first fully online university in 1996. The document then discusses research that has found e-PD can improve targeted student outcomes when teachers participate in a coordinated series of online courses. It also outlines strategies for achieving critical mass adoption of e-PD innovations.