Me Marine Cournier holds a Masters in International Law from the University of Montreal and a Law Degree from the University of Toulouse 1 Capitole. Me Cournier has been practicing for over 5 years in criminal and penal law. She has appeared before numerous first instance and appeal Courts. Me Cournier takes it upon herself to defend her clients tenaciously and with much dedication.

 Me Cournier is very involved in the legal community and sits on various boards of directors, notably that of the Barreau de Longueuil and the Jeune Barreau de Longueuil, where she served as president from 2019 to 2020. She is also a member of several committees including the Information Technology Committee of the Young Bar of Montreal. In 2020, Me Cournier received the distinction of Gouverneur de la Relève (Governor of the Next Generation) awarded by the Foundation of the Quebec Bar.