Alexandre was born in Montreal, raised in Hochelaga-Maisonneuve (east of Montreal), Canada.
Alexandre has been involved with Greenpeace for half of his life. He started as a canvasser at the end of the 1990s, helping the organisation to attract new supporters. In 2007, he participated in an action to protest against a port for nuclear submarines in Scotland. He was arrested there and had to spend several days in jail.
Alexandre comes from a family that has dedicated its life to help people; his mother was a nurse and his father was a fireman before they both retired. Alexandre is a passionate environmentalist who has served as a dedicated sailor and activist aboard Greenpeace ships for over seven years.