Mary Polak was re-elected as MLA for Langley in 2017, having represented the constituents of Langley since 2005.

Mary currently serves as the Official Opposition House Leader and sits on the Special Committee to Appoint an Information and Privacy Commissioner.

The Legislature appointed Mary to sit on both the Select Standing Committee on Education and the Special Committee to Appoint an Information and Privacy Commission and she is the Official Opposition House Leader.

Mary has acted as vice-chair of the Environment and Land Use Committee and as a member of both the Cabinet Working Group on Liquefied Natural Gas (LNG) and the Priorities and Planning Committee.

Previously, she served as Minister of Health, Minister of Environment, Minister of Transportation and Infrastructure, Minister of Aboriginal Relations and Reconciliation, Minister of Children and Family Development and Responsible for Child Care, Minister of Healthy Living and Sport, and Parliamentary Secretary to the Minister of Health.

Before being elected to the Legislature, Mary served as a trustee and chair of the Surrey school board.