David Miller was mayor of Toronto from 2003 to 2010.

As the city’s 63rd mayor, Miller was one of the dominant voices speaking in support of a national urban agenda, including a national transit strategy.

He also worked to make Toronto a world-leading city on environmental issues and on June 4, 2008 he was appointed chair of the influential C40 Group of World Cities leading the fight against Climate Change. As chair of C40, Mayor Miller had a key role in organizing the Copenhagen Climate Summit for Mayors which urged national governments at the COP15 Conference in Denmark to engage, empower and resource cities to meet the challenge of global warming.