Born in 1963 in Lisbon, Portugal and living in Canada since 1978, Alexandra Mendès has been an active and engaged citizen since her college days.

Prior to her entry into the political realm, Alexandra worked for her community with the Maison Internationale de la Rive-Sud (MIRS), a non-profit community organisation that provides support and assistance to new immigrants and refugees. With a degree in Management of Non-Government Organisations, she excelled at her vocation. From Coordinator and Deputy Director to Executive Director in 1996, she dedicated fifteen years of her professional life to the organisation's success in reaching financial viability, and increased recognition.

President of the Federal Liberal Association of Brossard - La Prairie, Alexandra began her political career as a riding assistant to the Hon. Jacques Saada.

From 2008 to 2011, she was the Member of Parliament for Brossard - La Prairie. During that time, her actions in the House of Commons were a testament to her continued dedication to her constituents through her strong advocacy on such issues as the replacement of Champlain Bridge and obtaining passport services at the Service Canada centre in Brossard.

Following the 2011 election, Alexandra continued her engagement by serving as President of the Quebec branch of the Liberal Party of Canada.

Since October 2015, Alexandra Mendès has been the Member of Parliament for the constituency of Brossard - Saint-Lambert. She was Deputy Chair of the Standing Committee on Public Accounts in the 42nd Parliament, and Deputy Chair of the International Executive of the Commonwealth Parliamentary Association from 2017 to 2019. In December 2019, Alexandra was appointed Assistant Deputy Speaker of the House of Commons. She remains co-chair of the Canada-Portugal Parliamentary Friendship Group. Since February 2022, Alexandra has also been the Chair of the Canadian Branch of the Commonwealth Parliamentary Association.