Peter was elected MLA for Kamloops-North Thompson in May 2017, and re-elected in October 2020. He is the Official Opposition critic for Indigenous Relations and Reconciliation, and the Official Opposition House Leader. Peter previously served as the Official Opposition critic for Environment and Climate Change and was a Member of the Select Standing Committees on Crown Corporations and Finance and Government Services.

Before entering provincial politics, Peter was mayor of Kamloops for three terms, after previously serving two as councillor. He served as chair of the Thompson Regional Hospital District for five terms, and was a director for the Thompson-Nicola Regional District since 2005.

Peter has also worked on the BC Transit Board of Directors, at PRIMECorp, and on the Local Government Contract Management Committee.

Peter and his wife Lianne are lifelong Kamloops residents, and the proud owners and operators of a local small business.  They have three grown children.