He holds a Bachelor's degree in Law from the University of Sherbrooke and a Master's degree in Law from the Université du Québec à Montréal (UQAM). He has been a member of the Barreau du Québec since 1990 and currently holds the position of Director of Criminal Prosecutions at the City of Montreal.

Me Gallant has pleaded before all criminal jurisdiction courts in Quebec. As a Crown prosecutor, he has worked on several complex cases related to organized crime. He has been teaching criminal law for over twenty years, notably at the Barreau du Québec and the Université du Québec à Montréal. In 2011, he was honoured with the distinction of Avocat émérite by the Barreau du Québec, and in 2019, he received the UQAM Recognition Award from the Université du Québec à Montréal.

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