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Brandon Johnson — the Cook County commissioner, former Chicago Teachers Union organizer and Chicago Public Schools teacher — was inaugurated Monday as Chicago’s 57th mayor.

Since winning the election, Johnson has been assembling a transition team, traveling to Springfield to meet with lawmakers in the Illinois General Assembly to lay out his hopes and goals for his first term and begun selecting his top aides, including his chief of staff.

The swearing-in occurred on May 15 at Credit Union 1 Arena on the University of Illinois at Chicago campus. The ceremony will start at 10:30 a.m. at the venue formerly known as the UIC Pavilion, 525 S. Racine Ave., for which tickets will be made available. That will be followed, starting at 2 p.m., by an open house at City Hall that will be open to the public.

Even before taking office, Johnson has already faced a test as large groups of young adults and juveniles swarmed downtown in mid-April, resulting in 16 arrests after three teens were shot. Johnson said in a statement: “It is unacceptable and has no place in our city. However, it is not constructive to demonize youth who have otherwise been starved of opportunities in their own communities.”

Take a look back at our full coverage of the mayor’s race, see 10 graphics showing voter turnout in the runoff election and see a breakdown of the results.

Here’s what to know about Chicago’s next mayor:

Brandon Johnson sworn in

Brandon Johnson commenced his mayoral term with a rousing promise to propel the “soul of Chicago” to its greatest era yet, capping off the former commissioner and longtime labor organizer’s once-improbable rise to be the most progressive leader of the nation’s third-largest city in decades.

What to expect from Mayor Brandon Johnson?

Chicago Mayor-Elect Brandon Johnson joins Illinois Gov. J.B. Pritzker Chicago Mayor Lori Lightfoot during a press conference to celebrate the selection of Chicago as the host for the 2024 Democratic National Convention on April 12, 2023.
Chicago Mayor-Elect Brandon Johnson joins Illinois Gov. J.B. Pritzker Chicago Mayor Lori Lightfoot during a press conference to celebrate the selection of Chicago as the host for the 2024 Democratic National Convention on April 12, 2023.

Once he takes the oath of office, Johnson will have to hit the ground running on a number of high-profile issues. That includes appointing a Chicago police superintendent, working with a new slate of aldermen on the City Council and preparing for the 2024 Democratic National Convention.

Brandon Johnson’s rise from union organizer to Chicago’s new progressive mayor, and the challenges he inherits

Facing CPD remake, Mayor-elect Brandon Johnson promises new approach, including adding police detectives

Allison Arwady has been the face of COVID-19 in Chicago. Will Mayor-elect Brandon Johnson keep her on?

Brandon Johnson ran a pro-worker, tax-the-‘ultra-rich’ campaign. Can he and business leaders find common ground?

Mayor-elect Brandon Johnson’s campaign promise to help steer youth from crime

Mayor-elect Brandon Johnson pushes his own plan to reshape City Council

Mayor-elect Brandon Johnson will face early examination from newly emboldened City Council

Aldermen who supported Vallas look to mend fences with Johnson yet stay true to themselves

With Brandon Johnson at the helm, big shifts are ahead for Chicago Public Schools

Democrats place big bet on Mayor-elect Brandon Johnson by tapping Chicago for ’24 convention

Mayor-elect Brandon Johnson will have to thread needle with key decision on who will lead Chicago police

Mayor Lori Lightfoot’s parting gift for Brandon Johnson: A smaller than anticipated budget gap

The transition

Mayor-elect Brandon Johnson speaks with the press after meeting with Mayor Lori Lightfoot at City Hall on April 6, 2023, in Chicago.
Mayor-elect Brandon Johnson speaks with the press after meeting with Mayor Lori Lightfoot at City Hall on April 6, 2023, in Chicago.

What was Johnson up to as he prepared for the May 15 inauguration? He had a transition team in place and began to name top members of his City Hall staff.

Mayor-elect Brandon Johnson names Chicago Teachers Union chief of staff as deputy mayor for education

Mayor-elect Brandon Johnson names interim CPD superintendent, discusses what he wants in a permanent police leader

Praise, advice for Mayor-elect Brandon Johnson at his last Cook County Board meeting: ‘Don’t second-guess yourself’

Mayor-elect Brandon Johnson’s inauguration plans set

As he prepares to be mayor, Brandon Johnson steering through city rules and supporters’ expectations

Mayor-elect Brandon Johnson’s top staff members bring different perspectives to City Hall but say they strike ‘a good balance’

Mayor-elect Brandon Johnson names union leader to head transition team

Mayor-elect Brandon Johnson picks longtime City Hall staffer as his chief of staff

Mayor-elect Brandon Johnson calls Chicago ‘a tale of two cities.’ Can he make it whole?

Brandon Johnson: Organizer. Anti-establishment. Servant-leader. From middle school teacher to Chicago mayor.

Brandon Johnson’s win as next Chicago mayor opens up his Cook County Board seat, for which he just won reelection in November

Lori Lightfoot’s legacy: A combative mayor who led Chicago through crises, some of her own making

Johnson on the issues

Mayor-elect Brandon Johnson is greeted warmly by people outside the Chinatown CTA train station in Chicago on April 5, 2023, following Johnson's runoff election victory over Paul Vallas.
Mayor-elect Brandon Johnson is greeted warmly by people outside the Chinatown CTA train station in Chicago on April 5, 2023, following Johnson’s runoff election victory over Paul Vallas.

What did Johnson say about the issues facing Chicago while he was campaigning? Here is a selection of articles from Tribune reporters who followed him on the campaign trail.

Brandon Johnson has spent four years on the Cook County Board. Does his record there stand up to the achievements he touts?

Chicago’s mayor candidates both have deep CPS ties — but starkly different visions for the future of schools

Crime a top issue for Chicago voters. Paul budget and Brandon Johnson offer sharp contrasts to public safety.

Brandon Johnson once said it was a ‘political goal’ to defund police. He’s been less precise running for mayor.

Chicago Teachers Union’s big spending on Brandon Johnson for mayor draws criticism over union influence and pushback among some members

In mayor’s race, Brandon Johnson unveils public safety plan