Lametti was elected as the Member of Parliament for the riding of LaSalle—Émard—Verdun in the 2015 Canadian federal election, and was sworn in as the 52nd Minister of Justice and Attorney General of Canada (MoJAG) on January 14, 2019.

On January 14, 2019, Lametti was appointed MoJAG by Prime Minister Justin Trudeau, and on April 15 of that year, he was appointed as a Queen’s Counsel, granting him the post-nominal letters “QC”.

On June 16, 2014, Lametti launched his bid to become the official candidate for the Liberal Party of Canada in the new riding of LaSalle-Émard-Verdun. Lametti won the contested nomination race on February 8, 2015, and won the riding’s seat in Parliament in the 2015 Canadian federal election. On December 2, 2015, Lametti was named parliamentary secretary to then Minister of International Trade Chrystia Freeland. On January 26, 2017, Lametti was reshuffled to parliamentary secretary to the Minister of Innovation, Science and Economic Development, Navdeep Bains.

In 1995, after having been a visiting lecturer at the Faculty of Law, University of New Brunswick, Lametti accepted a lecturing position at the Faculty of Law, McGill University, where he taught and conducted research. He became an assistant professor in 1998, an associate professor in 2003, and was promoted to full professor in 2015. He lectured and wrote on subjects related to civil and common law property, intellectual property, property theory and ethics. His work led to the creation of the Centre for Intellectual Property Policy, which he co-founded in 2003 and for which he served as director from 2009 to 2011. He was Associate Dean (Academic) of the McGill Faculty of Law between 2008 and 2011, was a member of McGill University’s Senate from 2012 to 2015, and was formerly a Governor of the Fondation du Barreau du Québec.

David Lametti became interested in politics as a teenager, when he worked as a volunteer for the Liberal Party in the 1979 Canadian federal election, and then subsequent provincial and federal elections for Liberal candidates. Among candidates for whom he volunteered are the former Canadian member of Parliament and Speaker of the House Gilbert Parent. Lametti co-founded the Erie Riding New Liberals, the youth wing of the Liberal Party of Canada in southern Niagara.

David T. Lametti PC QC MP (born August 10, 1962) is the current Minister of Justice and Attorney General of Canada. He is a Canadian legal scholar and Liberal politician, and was a Professor of Law at McGill University, a member of the Institute of Comparative Law, and a founding member of the Centre for Intellectual Property Policy.

Lametti was born on August 10, 1962, in Port Colborne, Ontario, Canada, to Italian immigrants. Lametti earned his Bachelor of Arts degree in economics and political science from the University of Toronto in 1985, and his Bachelor of Laws and Bachelor of Civil Law degrees at McGill University in 1989. He then served as a clerk to Justice Peter Cory of the Supreme Court of Canada in 1989–90. In 1991, Lametti completed a Master of Laws degree from Yale Law School and in 1999, he completed a Doctor of Philosophy degree in law at Exeter College, Oxford, with a thesis, The Deon-Telos of Private Property: Ethical Aspects of the Theory and Practice of Private Property.