Lee has over 24 years of broad experience in traffic operations, traffic design, transportation planning, and transportation research and education. He is recognized internationally for his expertise on roundabouts and has led national research and guide development on roundabouts for more than a decade. He serves on TRB’s Committee on Roundabouts and the National Committee on Uniform Traffic Control Devices’ roundabout task force, and he previously served as chair of the Unsignalized Intersections Subcommittee of the TRB Committee on Highway Capacity and Quality of Service. He has taught over 60 professional short courses on highway capacity, intersections, roundabouts, and signal timing, and he serves as an adjunct instructor at the University of Portland. Outside of work, Lee is an avid musician (piano and trombone) and photographer (landscapes, cityscapes, and wildlife). He has achieved a yearlong streak of 10,000 steps per day without any misses – twice.