Derek Mombourquette was first elected to the Nova Scotia House of Assembly as MLA for Sydney-Whitney Pier in a by-election in 2015 and was re-elected in 2017.
Prior to his election in 2015 he served on the Cape Breton Regional Municipality Council. As a Councillor he was Chair of the CBRM Police Commission and served on the NS Association of Police Boards. In addition, he was the VP of the Canadian Association of Police Governance. He has also held the role of Chair for the CBRM Heritage Advisory Committee.
Outside of politics, he was the coordinator of entrepreneurship support initiatives for Cape Breton University and the Nova Scotia Community College. He has also held the position of project coordinator in several industries within the private sector including tourism, industrial supply, and post-secondary education.