From 1996, as a consultant to the Ministère de la Métropole, he produced some ten studies on the redevelopment potential of vacant spaces around Montreal metro stations.

[3] In 2005, Bergeron ran simultaneously for Mayor of Montreal and City Councillor for the district of DeLorimier, located in the Borough of Plateau-Mont-Royal, under the Projet Montréal label.

On May 2, 2009, the Projet Montréal leader lodged a complaint with the Sûreté du Québec concerning the contract for water meters and the apparent link between it and the sale of the Contrecoeur site by the SHDM.

He asked the police to investigate the role of certain elected officials, highly placed civil servants or directors of the current administration in these matters.

On October 2, 2009, Bergeron announced his party's plan to open up the southern water front (now cast unused industrial zoned space) to residents as well as redevelop the eastern tip of Saint Helen's Island, which is now a parking lot.

[8] On October 8, 2009, Bergeron unveiled his party's plan for public transportation, in which he suggested that the price of STM monthly passes be reduced to $60 for adults and $30 for students.

[10] On October 19, accompanied by his chairman of fundraising, Justice John Gomery, Bergeron demanded a provincial inquiry into the financing of political parties.

[15] Besides Gomery, many notable celebrities came out to support Bergeron in the later stages of the campaign, including the Gazette's Henry Aubin,[16] world-renowned philosopher and McGill emeritus, Charles Taylor,[17] as well as a group of fifty local artists in their letter 'for the love of Montreal'[18] Despite polling at a statistical tie shortly before the election, Bergeron finished third in the mayoralty race.

He joined Lyn Thériault of Vision Montréal as opposition members on the Council, in a move meant to foster cooperation.

[19] Less than one year later, on November 4, 2010, Tremblay asked Bergeron to step down from the executive committee over his refusal to support a proposal to revamp the aging Turcot interchange.

On November 18, 2014, Bergeron left Projet Montréal to sit as an independent and join his former rival Denis Coderre's executive committee.

[22] Bergeron, in his 2005 book, Les Québécois au volant, c'est mortel, wrote a paragraph which raised questions about the events surrounding the September 11 attacks.

The events of that fateful day provided the mafias surrounding George W. Bush with a pretext for taking over the petroleum reserves of the Persian Gulf.