OUR TEAM
OUR TEAM
FOUNDING PARTNERNICHOLAS D'AOUST
Nicholas D’Aoust has nearly fifteen years of experience in designing and implementing legal and corporate strategies aligned with his clients’ business objectives.
He assists companies, entrepreneurs and professionals by offering practical, clear advice tailored to their specific circumstances. His practice mainly covers commercial transactions, contract drafting and negotiation, corporate governance, and handling the necessary administrative and regulatory procedures with public authorities.
Recognized for his strategic and collaborative approach, Mr. D'Aoust strives above all to gain a thorough understanding of his clients' needs and ambitions in order to build lasting relationships based on trust and focused on long-term success.
A graduate of the civil law program at the University of Ottawa and a member of the Quebec Bar and the Ontario Bar, he founded his own firm in 2014, which he continues to run with the same passion for rigor, transparency, and efficiency.
FOUNDING PARTNERNICHOLAS D'AOUST
Nicholas D’Aoust has nearly fifteen years of experience in designing and implementing legal and corporate strategies aligned with his clients’ business objectives.
He assists companies, entrepreneurs and professionals by offering practical, clear advice tailored to their specific circumstances. His practice mainly covers commercial transactions, contract drafting and negotiation, corporate governance, and handling the necessary administrative and regulatory procedures with public authorities.
Recognized for his strategic and collaborative approach, Mr. D'Aoust strives above all to gain a thorough understanding of his clients' needs and ambitions in order to build lasting relationships based on trust and focused on long-term success.
A graduate of the civil law program at the University of Ottawa and a member of the Quebec Bar and the Ontario Bar, he founded his own firm in 2014, which he continues to run with the same passion for rigor, transparency, and efficiency.
PARTNERALEXANDRA ROY
A skilled negotiator and litigator, Me Roy practices in a wide range of areas, where she is called upon to defend her clients’ interests in complex civil and commercial disputes with rigour and dedication. While she also focuses on dispute prevention and resolution, she is particularly drawn to the intellectual challenges of litigation and advocacy.
A graduate with honours from the University of Ottawa’s civil law program, Me Roy has been practising in the Outaouais region since her admission to the Quebec Bar in 2012. She joined DSR Legal in 2015 and became a partner in 2018.
PARTNERALEXANDRA ROY
A skilled negotiator and litigator, Me Roy practices in a wide range of areas, where she is called upon to defend her clients’ interests in complex civil and commercial disputes with rigour and dedication. While she also focuses on dispute prevention and resolution, she is particularly drawn to the intellectual challenges of litigation and advocacy.
A graduate with honours from the University of Ottawa’s civil law program, Me Roy has been practising in the Outaouais region since her admission to the Quebec Bar in 2012. She joined DSR Legal in 2015 and became a partner in 2018.
NOTARYME MARIA VALENTINA RIOS
Me Rios completed a law degree at the University of Ottawa in 2018 as well as a master's degree in notarial law at the University of Sherbrooke. Admitted to the Quebec’s notary’s chamber in 2020, she joined the DSR team in 2021, where she contributes with her expertise to the corporate law team.
More specifically, Me Rios focuses her practice on transactional matters such as business start-ups, corporate reorganizations, or business transfers by sale of assets or sale of shares. Her main objective is to offer a personalized service of the best quality in order to meet the specific needs of each of her clients. Her integrity and her empathy make her a trusted notary who will promote good collaboration with her clients under great guidance.
Me Rios is able to offer her legal services in French, English and Spanish.
NOTARYME MARIA VALENTINA RIOS
Me Rios completed a law degree at the University of Ottawa in 2018 as well as a master's degree in notarial law at the University of Sherbrooke. Admitted to the Quebec’s notary’s chamber in 2020, she joined the DSR team in 2021, where she contributes with her expertise to the corporate law team.
More specifically, Me Rios focuses her practice on transactional matters such as business start-ups, corporate reorganizations, or business transfers by sale of assets or sale of shares. Her main objective is to offer a personalized service of the best quality in order to meet the specific needs of each of her clients. Her integrity and her empathy make her a trusted notary who will promote good collaboration with her clients under great guidance.
Me Rios is able to offer her legal services in French, English and Spanish.
TAX LAWYERALEXANDRE SIROIS-TRAHAN
A member of the Barreau du Québec since 2005, Alexandre Sirois-Trahan has advised the business community, including private sector companies on a broad range of legal matters such as retail, manufacturing, construction, real estate, engineering, services, and health. He also counsels registered non-profit and charitable organizations on business law and Canadian tax laws, particularly concerning tax litigation—income tax and sales tax— as well as providing sales tax advisory services.
He began his career with a large Montreal law firm before moving to the Outaouais region in 2009. He practised law for several years in major national and international accounting firms in both Ottawa and Gatineau as a senior sales tax team leader.
TAX LAWYERALEXANDRE SIROIS-TRAHAN
A member of the Barreau du Québec since 2005, Alexandre Sirois-Trahan has advised the business community, including private sector companies on a broad range of legal matters such as retail, manufacturing, construction, real estate, engineering, services, and health. He also counsels registered non-profit and charitable organizations on business law and Canadian tax laws, particularly concerning tax litigation—income tax and sales tax— as well as providing sales tax advisory services.
He began his career with a large Montreal law firm before moving to the Outaouais region in 2009. He practised law for several years in major national and international accounting firms in both Ottawa and Gatineau as a senior sales tax team leader.
LAWYERME AUDREY CHIASSON SÉGUIN
Me Audrey Chiasson-Séguin, LL.L., is originally from the Outaouais region and holds a civil law degree from the University of Ottawa where she graduated summa cum laude. She has been practicing law in the area since her admission to the Tableau de l’Ordre of the Barreau du Québec in 2019.
In September 2025, Me Chiasson-Séguin joined the firm DSR Legal, where she focuses her practice on civil and commercial litigation, as well as contract law. Over the years, she has represented clients before various judicial and administrative tribunals, at both trial and appellate levels.
Me Chiasson-Séguin is recognized for her precision, professionalism and her ability to accurately assess and respond to her clients’ legal needs as well as her strong skills in legal drafting and negotiation. She provides strategic legal support in advisory, drafting and representation mandates and guides her clients in considering and implementing alternative dispute prevention and resolution mechanisms.
LAWYERME AUDREY CHIASSON SÉGUIN
Me Audrey Chiasson-Séguin, LL.L., is originally from the Outaouais region and holds a civil law degree from the University of Ottawa where she graduated summa cum laude. She has been practicing law in the area since her admission to the Tableau de l’Ordre of the Barreau du Québec in 2019.
In September 2025, Me Chiasson-Séguin joined the firm DSR Legal, where she focuses her practice on civil and commercial litigation, as well as contract law. Over the years, she has represented clients before various judicial and administrative tribunals, at both trial and appellate levels.
Me Chiasson-Séguin is recognized for her precision, professionalism and her ability to accurately assess and respond to her clients’ legal needs as well as her strong skills in legal drafting and negotiation. She provides strategic legal support in advisory, drafting and representation mandates and guides her clients in considering and implementing alternative dispute prevention and resolution mechanisms.
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