From the Ontario Public School Boards’ Association website: 

https://elections.ontarioschooltrustees.org/WhatDoTrusteesDo/SchoolBoardTrustees.aspx

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“A trustee’s role is to maintain a focus on student achievement and well-being and to participate in making decisions that benefit the entire board district while representing the interests of his or her constituents. Trustees must also communicate the views and decisions of the board back to their constituents.”

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People for Education, which is an “independent organization working to support public education in Ontario’s English, French and Catholic schools“, has an excellent web page titled: "Who Does What in Ontario's Education System" where you can find great information about all stakeholders, including trustees:

https://peopleforeducation.ca/public-education-in-ontario/#whodoeswhat