Brandon Johnson was sworn in as mayor of the nation’s third-largest city Monday at a ceremony attended by Illinois Gov. J.B. Pritzker and U.S. Sens. Tammy Duckworth and Dick Durbin.

Johnson, 47, a progressive former union organizer and teacher, won a tight runoff in April against former city budget director Paul Vallas after Lori Lightfoot lost her bid for a second term as Chicago mayor. The mayoral race focused largely on public safety, taxes and education and was seen as a major win for progressive groups.

Johnson congratulated the city’s other newly elected officials and shared his vision for the future of Chicago.

“Our stories get to reach well beyond this moment, they do,” he said. “And I’m grateful that I will be working with a body of government that is committed to that transformation.”

Who is Brandon Johnson?

Johnson is a former public school teacher and organizer for the Chicago Teachers union, which he supported during a strike in 2019. He was one of 10 siblings growing up in Cabrini Green, a former public housing complex where he later became a teacher. He’s raising three children in a neighborhood on the West Side that sees some of the city’s highest rates of gun violence.

“Growing up one of 10 in a working-class family, it teaches you a lot of things, but I never could have foreseen this,” Johnson said Monday. “Now, make no mistake about it, that doesn’t mean that I’m not prepared.”

Johnson was elected as a Cook County Commissioner in 2018, a position from which he resigned ahead of his mayoral inauguration. He was not well known when he entered the mayoral race in 2022, but his progressive campaign focused on addressing the root causes of violence attracted endorsements from U.S. Sens. Bernie Sanders and Elizabeth Warren.