Our Firm

Founded more than 40 years ago, Shadley Costom is one of the oldest firms practicing criminal, penal and disciplinary law in Canada

Shadley Melançon was founded in 1967 by two young Crown attorneys. Over the years it became Shadley, Melançon & Boro, then became Shadley Battista and is now known as Shadley Costom. It is one of the oldest firms practicing criminal and penal law in Québec.

At the heart of our practice is an unwavering commitment to provide each client with the attention and service that he or she needs and deserves. We understand that these moments are some of the most important in your life. We take the time with you to explain the law and the procedure answer all your questions and provide a strategic roadmap to the legal challenges you face. Furthermore, Shadley Costom is a true partnership. When you retain a lawyer from Shadley Costom, you benefit from the resources and experience of an entire team of lawyers, each one with his or her particular skills and expertise.

The current partners at Shadley Costom have a combined 70+ years of experience in criminal defence. We represent clients charged pursuant to the Criminal Code, as well as in relation to statutory penal matters. We continue to plead cases at all levels of court including our municipal courts, the Court of Québec (adult and youth court), the Superior Court, the Québec Court of Appeal and the Supreme Court of Canada. We also represent clients on disciplinary and ethics issues before the tribunals of professional orders, disciplinary committees of professional corporations and the Tribunal Administratif du Québec.

We have played an important role in federal and provincial commissions of inquiry, acted as ad hoc prosecutors, represented the Barreau du Québec and acted on behalf of the wrongfully convicted. We have also taught at some of the leading academic and professional institutions in Canada such as the Federation of Law Societies National Criminal Law Program, The National Judicial Institute, l’École du Barreau du Québec, McGill University and l’Université du Québec à Montréal.

Prior to their judicial appointments, a Court of Appeal (Judge Patrick Healy), two Superior Court judges (Judges Marc David and Guy Cournoyer) and three Québec Court judges (Judges Claude Melançon, Robert Sacchitelle, and Erick Vanchestein) were members of our firm.

Our Team

The dedication and experience of every member of our firm are what set us apart.

  • Myriam Laurier


    Me Myriam Laurier has been a member of the Quebec Bar since 2015, and she obtained a Bachelor of laws from University of Montreal. Before joining Shadley Costom, she articled at Montreal’s Municipal court, where she acted as a Crown prosecutor in numerous cases involving the Highway Safety Code, municipal matters and federal infractions. During her studies at the University of Montreal, she was a member of the Comité de droit pénal. She is currently enrolled in a postgraduate degree on Financial and Economic Crimes (DESS). Fully bilingual, Me Laurier represents clients in both French and English.

  • Richard E. Shadley

    Attorney, QC, Ad.E.

    Richard E. Shadley has been a member of the Barreau du Québec since 1964 and has dedicated his entire career to the practice of criminal and penal law. He has appeared before every level of criminal courts, from the municipal court to the Supreme Court of Canada. In March 1965, he joined the Provicial Crown’s office which he left in September 1967 in order to found, with Claude Melançon (subsequently a Québec Court judge), the firm Shadley Melançon. In 1999, a new firm was created under the name Shadley Battista. Since June 2016, the firm has been known under the name Shadley Costom.

    Mr. Shadley has participated in several commissions of inquiry, either as Commissioner, counsel to the Commission, or representing individual interests. He has also acted as an agent for the Attorney General of Québec in a number of sensitive prosecutions. In addition he was named an ad hoc Coroner, which lasted about a year, dealing with an industrial accident. Mr. Shadley was a part-time course lecturer at McGill University Faculty of Law in the late 1970s to 1980s. He still occasionally lectures at the law school.

    For over 20 years, Mr. Shadley was a lecturer at the annual Criminal Law Conference of the Federation of Law Societies of Canada. He was named to the Queen’s Counsel in 1992, became a fellow of the American College of Trial Lawyers in 1994 and, in 2008, the Barreau du Québec awarded him the “Avocat émérite” title. He has also been listed in the Best Lawyers in Canada directory.

  • Matthew S. Shadley


    Prior to joining Shadley Costom, Matthew Shadley completed his Bachelor of Law at the Université de Montréal. During his studies, Matthew represented the Université de Montréal in the Gale Cup Moot Competition. Matthew joined Shadley Costom as an articling student and remained with the firm since. Matthew practices exclusively in criminal and penal law. Matthew has worked on files involving road safety, assault, fraud and drug-related offences.

    Prior to attending law school, Matthew completed a Bachelor of Arts in joint-honours History and Political Science at McGill University. He is currently a member of the Young Bar Association of Montreal and The Lord Reading Society.

  • Mairi Springate


    Mairi Springate obtained her civil and common law degrees from McGill University in 2008. During her studies she worked extensively as a research assistant on a project exploring the criminalization of polygamy. A firm believer in the importance of diverse interests, she also has a Bachelor of Arts in Italian Language and Literature.

    Mairi Springate articled in Toronto at the Crown Law Office – Criminal in Toronto (appellate division) and has experience before both trial and appellate courts. She became a member of the Law Society of Upper Canada in 2010 and of the Québec Bar in 2011. Since 2012 she has acted as lawyer supervisor for Pro Bono Students Canada McGill. She joined Shadley Costom in 2010.

  • Marie-Noël St-Hilaire


    Marie-Noël St-Hilaire became a member of the Québec Bar in 2011 and represents clients in all matters relating to criminal and penal law. Prior to joining Shadley Costom in February 2014, Marie-Noël spent two years working as a securities and mergers & acquisitions lawyer for Norton Rose Fulbright Canada LLP in Montreal. She is accustomed to both managing complex finance-related files as well as providing personalized service on a smaller-scale to all of her clients.

    Marie-Noël obtained her law degree from McGill University in 2010. Recipient of the 2009 Brett Code Scholarship in Criminal Law, she was actively involved in many aspects of student life at the Faculty of Law and served as a volunteer in a number of capacities. These include as Director of Community Services for the McGill Legal Information Clinic in 2008-2009, as Student Director for the organization Innocence McGill in 2008-2009 and as the student initiator of a seminar on the subject of wrongful convictions. During the last year of her studies, she clerked for the Honorable Steve. J. Reimnitz, judge at the Superior Court of Québec.

    Prior to beginning her career as a lawyer, Marie-Noël spent four months volunteering in Chile for a governmental program aimed at assisting women and children who are victims of domestic violence. She is fluent in English, French and Spanish and is also a member of the New York State Bar.

Our Services

We are committed to offering services personalized to the needs of every client, from the beginning to the end of the file.

Our firm specializes in criminal law, penal law and disciplinary law. We represent clients throughout Quebec and, at times, elsewhere in Canada.

Our personalized services begin with in-depth consultations that allow us to explain to each of our clients the relevant law and the procedure that lies ahead for him or her. That commitment to our clients extends throughout the attorney-client relationship – all the way to the end of the file.

Every case is different, and every client is important. We examine the optimal strategy for each client and explore all appropriate avenues of defence. We counsel our clients in their best interests and advise them of the best option to follow. We combine decades of experience and legal excellence with the personal attention that every client deserves at such an important moment in their lives.

From bail hearings to preliminary inquiries and trials, and from sentence hearings to appeals, we represent our clients before all levels of court.

While most of our clients are already facing one or more criminal charges, we do also advise and consult with individuals and businesses that are under investigation or on whom search warrants have been issued. We also work with immigration, corporate, tax and family lawyers on files where appropriate.