Peter was elected MLA for Kamloops-North Thompson in May 2017, and re-elected in October 2020. He is the Shadow Minister for Finance. Peter previously served as critic for Indigenous Relations and Reconciliation, critic for Environment and Climate Change Strategy, and the Official Opposition House Leader.

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.