Walker, spurred on by a coalition of neighborhood groups (Federal of North Toronto Residents Associations) vigorously opposed to the development of the Minto Midtown project, which substantially exceeded the existing height and density limits when it was proposed in 2000.
He is viewed as an independent and has never sided with the left or right factions on the city council.
His reluctance to choose sides has meant that he has rarely been appointed to important city committees.
It was not until the 2003 term of office that he was appointed chair of the Administration Committee.
A long-time advocate of campaign finance reform, Walker is also known for having been one of only two Toronto City Councillors who did not accept corporate donations.