[1] Notable policy legacies of Seiling include the controversial "countryside line", a municipally managed greenbelt[2] and the development of Waterloo's light rail transit system, which was a defining topic in the 2014 election.
[4] After 2014, Seiling was selected to co-lead a provincial report into efficiency and reform in municipal regional government.
In his 1985 race to replace retiring chair James Gray, many other municipal politicians were considered as possible contenders, but he was elected, likely by a coalition of rural councillors.
[11] Seiling was not willing to commit regional staff resources to analysis of reform, creating internal controversy with other municipal politicians.
[23] The casino plans were ultimately shelved after the gaming commission stipulated that construction would have to occur specifically at an already existing horse racetrack.
[25] In 2015, after advocacy on the part of Seiling among others, the provincial government committed to being construction on expansion of Highway 7 between Waterloo and Guelph, which had been planned since 1989.
[27][28][5] The province ultimately decided not to assert amalgamation on regional governments, keeping the report confidential, and Seiling expressed disappointment more recommendations were not adopted.