Nearly 8,000 attend Walsh’s installation at BC In crowd, friends, family, and famous faces ← Related Article Visit The Boston Globe Share on Twitter Share on Facebook Comment on this Scroll to top of page David L. Ryan/Globe Staff Martin Walsh waved after he was sworn in. Dina Rudick/Globe Staff Martin Walsh was sworn in as mayor of Boston as his mother, Mary Walsh, and longtime girlfriend Lorrie Higgins looked on. David L. Ryan/Globe Staff Cardinal Sean O’Malley, Senator Elizabeth Warren, and Governor Deval Patrick applauded. Dina Rudick/Globe Staff Members of the audience listened during Walsh's inauguration speech. Dina Rudick/Globe Staff Walsh and Higgins shared a smile after he was sworn in. Jessica Rinaldi for The Boston Globe William Evans, acting commissioner of the Boston Police Department, watched the ceremony. Jessica Rinaldi for The Boston Globe Cellist Yo-Yo Ma played at the inauguration. Dina Rudick/Globe Staff Yo-Yo Ma had a few quick words for Martin Walsh before Walsh was sworn in as mayor. Jessica Rinaldi for The Boston Globe Mayor Walsh waved after his inauguration ceremony at Boston College’s Conte Forum. Jessica Rinaldi for The Boston Globe Former mayoral candidates Charlotte Golar Richie and John Connolly embraced before the start of the ceremony. David L. Ryan/Globe Staff Mayor Walsh waved during the ceremony. David L. Ryan/Globe Staff Senator Warren spoke at the inauguration. Dina Rudick/Globe Staff "Today, we are sworn in together," Walsh said. "Together, we are committing to do all we can for the city we love." Suzanne Kreiter/Globe staff Mayor Menino left keys to the mayor's office next to a letter for Walsh on the mayor's desk. Dina Rudick/Globe Staff Governor Patrick spoke at the inauguration. David L. Ryan/Globe Staff Martin Walsh gave a thumbs up during his inauguration ceremony. Dina Rudick/Globe Staff Walsh was welcomed to the stage before being sworn in as mayor of Boston. Dina Rudick/Globe Staff Senator Warren's eight-year-old granddaughter, Lavinia Tyagi of Los Angeles, bided her time before the inauguration. Dina Rudick/Globe Staff Walsh becomes Boston's 48th mayor.