Having graduated from Université Laval in 2000 and later called to the Barreau du Québec, Me Sébastien Gagnon has been practicing criminal, penal and administrative law for nearly 20 years.
In 2001, he began his career as a crown prosecutor in Gatineau, and worked on particular cases of alcohol-impaired driving, sexual assault, theft and fraud. He was subsequently responsible for the penal sector, and that experience led him to specialize in offence reports.
With his solid experience as a crown prosecutor, Mr. Gagnon joined the Leblanc Donaldson team as defence counsel in 2006, and was assigned to the firm’s criminal, penal and administrative matters.
In 2015, along with Me Paul Charlebois and Me Michel Swanston, Me Gagnon founded CSG Avocats, the largest and most prestigious criminal law firm in the Outaouais region.
Me Gagnon is a skillful and devoted litigator. He often pleads at the Municipal Court, the Court of Québec, on appeal to the Superior Court and before the various administrative authorities. He works on all types of criminal records, but specializes in impaired driving, dangerous driving, sexual assault, assault, theft and fraud.
In addition to having extensive experience in criminal law, Mr. Gagnon has developed expertise in the processing of all types of statements of offence. Whether they are related to the Highway Safety Code, the Commission de la construction du Québec, the Régie du bâtiment du Québec, the Ministère du Revenu or the Autorité des marchés financiers, he always succeeds in exceeding his clients’ expectations.
Considering his family background in construction, transportation and catering, Me Gagnon is more than happy to represent his clients before the Commission des transports du Québec, the Régie des Alcools, and any other administrative body.
He has also developed a strong expertise in professional corporation matters. Over the course of his career, he has represented many professionals (notaries, doctors, architects, real estate agents, etc.) who were being sued by their professional order.
In addition to his practice at the firm, Mr. Gagnon has been teaching criminal law at the École du Barreau for almost 10 years. He also trains other lawyers during various conferences and professional development activities. In doing so, he refreshes his knowledge of the latest developments in legal matters, and shares with a wide range of peers that can help advance criminal and penal law.
Me Gagnon stands out for his transparency, objectivity, perseverance and attention to detail. He also known to offer his clients useful and outstanding legal advice to help them navigate through tough times.
Past and Present Involvements
- Association des avocats et avocates de la défense du Québec
- Association des avocats et avocates de la défense de l’Outaouais
- Association des avocats et avocates de province
- Barreau de l’Outaouais
- Professor at the École du Barreau (criminal and penal law)
- Professor at La Cité collégiale (criminal and penal law)
- Mentorship as a criminal lawyer for the Barreau du Québec
- Trainer at AJBO in criminal and penal law
- Excellence Award presented by the Association des avocats et avocates de la défense du Québec for his remarkable work in dealing with impaired faculties cases.