Prior to his election to the mayoralty, Brown represented Ward 7 on London City Council.
[4][5] In a 2017 episode of the television series Political Blind Date, Brown and Giorgio Mammoliti discussed their differing perspectives on the issue of safe injection sites.
[6] In April 2018 Brown announced that he would not seek re-election in the upcoming municipal election.
[9][10][11] The London Integrity Commissioner issued a report to City Council stating that Matt Brown and Maureen Cassidy violated sections 2.4, 5.1 and 5.1(1)(e) of the Municipal Code of Conduct.
[12] In the report the integrity commissioner stated that he "has no authority" under current guidelines, to demand a resignation or prevent either office holder from running for re-election.