She graduated from the University of Montreal and was admitted to the Quebec Bar in 1991.
For twenty-eight years, Marie-Hélène has practiced family law, a field she loves above all for its humanity and the variety of knowledge it requires. A devoted mother of three, her personal experiences have enhanced her perspective on family law.
Marie-Hélène has appeared twice before the Supreme Court of Canada. She assisted Eva Petras, now the Associate Chief Justice of the Superior Court of Quebec, as amicus curiae to the Supreme Court of Canada (Bibaud c. Québec (Régie de l’assurance maladie), 2004 CSC 35,  2 R.C.S. 3). With Anne-France Goldwater, she argued a case concerning the right to Jewish religious divorce (Bruker c. Marcovitz, 2007 SCC 54,  3 S.C.R. 607).
From 2000, Marie-Hélène has fought against discrimination faced by gay and lesbian couples, helping them obtain the right to marry partners of the same sex.
Marie-Hélène has also attacked the problem of inequality between families formed by married couples and families featuring unwed couples. She helped build the case of Eric v. Lola, with the goal of obtaining rights for unmarried spouses in Quebec. Because of this highly-publicized case, family law reform in Quebec is forthcoming and the rights of unwed couples will be one of its main focal points.
Aside from fighting for the rights of same-sex and unwed partners, she has also tackled the discrimination faced by Quebec’s single mothers and their children, denouncing the inadequacy of the Quebec Child Support Guidelines.
She is a fierce advocate for equality and diversity in Quebec society and promotes the respect of minority-groups’ fundamental rights and freedom.
From 2015 to 2017, she was co-chair of the Commission des communautés culturelles of the Quebec Section of the NDP and, in 2016 to 2018, she was a board member of the Quebec Section of the NDP, as “vice-présidente des politiques et statuts”.