While a student at Concordia in 2002, Peter Schiefke launched the We Will Always Remember (WWAR) project, aimed at raising awareness among youth of the sacrifices made by Canadian soldiers around the world, for which he received the Minister of Veterans Affairs Commendation in 2003.

In August 2018, he was asked to take on additional responsibilities and serve as the Parliamentary Secretary to the Minister of Border Security and Organized Crime Reduction, Bill Blair.

The ban on harmful single-use plastics was announced by Prime Minister Justin Trudeau on 7 October 2020, and is projected to come into force at the end of 2022.

The CEPA legislation, Bill C-28: Strengthening Environmental Protection for a Healthier Canada Act, was tabled in the House of Commons on 13 April 2021, but ultimately died on the order paper when the election was called on 15 August of that same year.

In March 2021, he was appointed the Parliamentary Secretary to the Minister of Immigration, Refugees, and Citizenship and served in that capacity until the Federal election was called on 15 August of the same year.