Lee has more than 27 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 other intersection types, and he has guided intersection planning, analysis, design, and research projects throughout the United States and internationally. He is a founding member of TRB’s Committee on Roundabouts and the National Committee on Uniform Traffic Control Devices’ Roundabout Task Force. Lee previously served as chair of the Unsignalized Intersections Subcommittee of TRB’s Committee on Highway Capacity and Quality of Service and has taught more than 70 professional short courses on highway capacity, intersections, roundabouts, and signal timing. Outside of work, Lee is an avid pianist and aspiring trombonist; loves capturing landscapes, cityscapes, and wildlife with his cameras; has traveled for work and fun to all 50 states and five continents; and can claim not one but two yearlong streaks of 10,000 steps per day.