The term 'Longtime Chicago Mayor' refers to Richard M. Daley, who served as mayor of Chicago from 1989 to 2011. He was the longest-serving mayor in the city's history and the third-longest serving mayor of any major American city. During his tenure, he oversaw the development of Millennium Park, the expansion of O'Hare International Airport, and the construction of the city's first new downtown park in over a century.