Progressive Democrat Brandon Johnson Sworn In as Mayor of Chicago

Then-Chicago Mayor-Elect Brandon Johnson (L) and Illinois Governor J.B. Pritzker speak to the press after a meeting in the governor's office in Chicago, Ill., on April 07, 2023. Scott Olson/Getty Images

Brandon Johnson, a progressive Democrat, was sworn in as the 57th mayor of Chicago on May 15.

He succeeds Democrat Lori Lightfoot, who lost in the Feb. 28 primary after years of coming under fire on issues ranging from COVID-19 to public safety. Johnson, 47, defeated Paul Vallas, a 69-year-old moderate Democrat in an upset in the April 4 runoff.