Hani S. Mahmassani was a Lebanese-American engineer who was the William A. Patterson Distinguished Chair in Transportation at Northwestern University and the Directory at the Northwestern University Transportation Center (NUTC). He held joint appointments in Industrial Engineering and Management Sciences at the Robert R. McCormick School of Engineering and Applied Science and in Managerial Economics and Decision Sciences at the Kellogg School of Management. He is widely regarded as one of the most influential figures in modern transportation engineering and was elected into the National Academy of Engineering in 2021 for his contributions to modeling of intelligent transportation networks and to interdisciplinary collaboration in transportation engineering.