Dr. Peter Stopher, Professor of Transport Planning at the University of Sydney, was the OTREC visiting scholar at the CTS Seminar on May 18, 2007. Dr. Stopher's teaching and research is in transport policy and planning, survey methods, travel demand modeling, and environmental analysis, and he is pioneering the use of GPS devices in transport surveys. Current research has focused on using personal GPS devices to collect travel behavior data of individuals. Dr. Stopherís seminar, "Using a GPS Panel to Evaluate Travel Behavior Changes," described projects that have been conducted and are currently underway using GPS. He described survey procedures and provided an overview of early results from data collection. The seminar was followed by a luncheon with faculty, students and members of the Oregon Modeling Steering Committee (OMSC).