This document summarizes research on assessing teaching presence in online courses. It discusses previous models for measuring teaching presence and reviews relevant literature. The research questions ask if existing measurement tools are sufficient and what patterns of teaching presence do or do not exist. The methodology section outlines a content analysis study of instructor messages in online courses to test a revised tool for measuring teaching presence. The analysis found patterns of teaching presence varied across early, middle and late sessions in courses. The conclusions discuss transforming roles for online instructors and questions for future study.