Our lawyers are distinguished by their wealth of litigation experience – gained through regular appearances in all levels of the courts, before administrative and regulatory tribunals, as well as mediation and arbitration. Lenczner Slaght partners, ranked among the best of their peers nationally, lead a recruitment and mentoring program that attracts gifted litigators who are committed to upholding the highest professional standards.

From commercial disputes and class actions to cross-border matters and professional regulation, we bring expert strategy – backed by rigorous research, data management and administrative support – to highly demanding cases in all litigation practice areas.

Chambers Global Chambers Global 
"Lenczner Slaght has the expertise and experience to position a case for success, enhance the prospect of a favourable resolution – and achieve positive results in a hearing or trial."

    – Chambers Global 2017

For the 15th consecutive year, Lenczner Slaght has been ranked by Chambers Global 2017 in the area of Dispute Resolution. Lenczner Slaght is the only Canadian litigation boutique ranked in the areas of Dispute Resolution and Dispute Resolution: Class Action (Defence).

In addition to the firm rankings, the following Lenczner Slaght lawyers were also ranked:

Chambers Global noted that Lenczner Slaght is "known for its wealth of talent" and that "the firm’s trial and appeal lawyers are distinguished by their depth of courtroom experience."

Chambers Canada Chambers Global 

Lenczner Slaght has once again been ranked in Chambers Canada 2017 in the areas of Dispute Resolution (Nationwide and Ontario), Dispute Resolution: Class Action (Defence) and Healthcare.

In addition to the firm rankings, the following Lenczner Slaght lawyers have been recognized:

Canadian Legal Lexpert® Directory
"[In] the crowded space of Toronto litigation firms, boutiques and large firms compete across the bull's eye. Lenczner Slaght Royce Smith Griffin LLP, a large litigation boutique in Toronto, stands alone at the head of the list."

     – Lexpert/American Lawyer Guide to the Leading 500 Lawyers in Canada 2011

The 2017 Canadian Legal Lexpert® Directory recognizes the professional excellence of 21 lawyers at Lenczner Slaght, who have been ranked among Canada's best in the annual peer-based ratings conducted by Lexpert, a leading source of news and information about the Canadian legal profession.

The following Lenczner Slaght lawyers have been selected through peer surveys as leading practitioners: Ian Binnie, C.C., Q.C., Alan J. Lenczner, Ronald G. Slaght, Michael Royce, Glenn Smith, Peter Griffin, Tom Curry, William C. McDowell, Peter Osborne, Anne Posno, Lawrence Thacker, Risa Kirshblum, Mark VenezianoNina Bombier, Monique Jilesen, Eli Lederman, Matthew SammonRebecca Jones, Jaan Lilles, Shara Roy, and Dena Varah.

Lenczner Slaght lawyers have been recognized for their expertise in Arbitration, Class Actions, Commercial Insurance Litigation, Corporate/Commercial Litigation, Defamation, Directors’/Officers’ Liability Litigation, Insolvency Litigation, Intellectual Property Litigation, Medical Negligence, Product Liability, Professional Liability, Public Law Litigation, and Securities Litigation.

In addition, Lenczner Slaght has been recognized in the following seven practice areas:

Most Frequently Recommended:

Consistently Recommended:

Also in this directory, Lexpert has once again placed Lenczner Slaght at the centre of the Bull's Eye – its highest possible rating for a litigation practice.

Click here to view the Litigation Lawyers Who’s Who: Toronto Bull’s-eye

Click here to view the Commercial Litigation Lawyers Who’s Who: Toronto Bull’s-eye

Click here to view the Intellectual Property Lawyers Who’s Who: Toronto Bull’s-eye

Benchmark Canada

Benchmark Canada
"The litigation stable to beat…The number of cases they try at Lenczner Slaght eclipses that of any other firm in Toronto… They're the best, and you won't hear anyone in Canada say otherwise…When other firms slink off and shy away from a case that seems too hot to handle, Lenczner Slaght is famous for saying ‘hell yes, we'll take this to trial!' – and waiting for their opponents to blink first, which they usually always do."

     – Benchmark Canada: The Definitive Guide to Canada's Leading Litigation Firms and Attorneys

Lenczner Slaght is "a fortress inhabited by litigation royalty" and ranks several of the firm's lawyers among "Toronto's most called-upon litigators." Recognized in the 2017 Benchmark Canada rankings are Peter GriffinTom Curry, Peter J. Osborne, Monique JilesonWilliam C. McDowell, Lawrence E. Thacker, Mark VenezianoAndrew Skodyn, Eli S. Lederman, Sana HalwaniMatthew Sammon and Rebecca Jones.

Interviewed by Benchmark Litigation in 2017, a peer raves, "In that entire team, I haven't seen anything even closely resembling a weak link. They are a full-tilt onslaught of litigation talent, but mixed with civility. These are people that it's a pleasure to litigate against; it's hard-fought, elbows-up stuff but all throughout there is not one moment where you wonder if this is what you want to be doing with the rest of your life."

Canadian Lawyer
"The proportion of top-quality litigators is incredible."

    – Canadian Lawyer, 2012

Lenczner Slaght was again recognized as one of Canada's Top 10 litigation boutiques in the latest annual review published by Canadian Lawyer magazine.

IAM Intellectual Asset Management Patent 1000

"a well-respected group including some of the best lawyers in Ontario."

    – IAM Patent 1000, 2015

IAM Patent 1000, the guide to leading private practice patent professionals and firms, is dedicated to recognizing best-in-class patent prosecution, licensing and litigation practitioners on a global basis. 

Lenczner Slaght was recognized for its expertise in intellectual property and for "…commercial contentious practice in the patent sphere."

In addition to the firm's ranking, Marguerite Ethier was acknowledged for being a "…life science whiz [and is an] incredibly strong advocate." while Andrew Skodyn "a man of many talents has demonstrated his flair for oral argument at the Supreme Court..."

Who's Who Legal

Who's Who Legal: Canada is an annual ranking of Canadian lawyers in 34 areas of business law, based on peer review surveys and interviews with general counsel and lawyers in private practice.

The following Lenczner Slaght lawyers have been selected through peer surveys as leading practitioners in the following areas of practice:

Commercial Litigation:

Life Sciences


Best Lawyers


Best Lawyers  is an annual guide to the international legal profession.

Since the annual peer ratings were inaugurated in Canada in 2006, Lenczner Slaght has been recognized for the excellence of its practitioners in a wide range of areas.

The 2017 Best Lawyers guide recognizes the following Lenczner Slaght lawyers: Ian Binnie C.C., Q.C.Alan J. Lenczner, Ronald G. Slaght, Michael E. Royce, Glenn Smith, Peter Griffin, Tom Curry, William C. McDowell, Marguerite Ethier, Peter J. Osborne, Anne E. Posno, Risa M. Kirshblum, Mark VenezianoAndrew SkodynNina BombierMonique Jilesen, Eli S. Lederman, Matthew Sammon, Rebecca Jones, Jaan Lilles, Dena N. VarahShara N. Roy, and Nadia Campion.

In addition to the rankings, Lenczner Slaght was named Law Firm of the Year for the practice area of Medical Negligence.