Lexpert Ranked Law Firm

Lax O’Sullivan Lisus Gottlieb LLP is a premier independent litigation practice. We conduct high profile, complex litigation creatively and efficiently. The firm’s counsel practice is headed by some of Canada’s leading commercial litigators. The partners have extensive litigation experience. Each has earned a reputation for excellence in advocacy and for innovative strategies, not only in successfully litigating and resolving disputes, but in avoiding them as well.

Our partners are among the most consistently recommended counsel in Canada, according to various surveys of the profession. Seven of the partners have been acknowledged as leading practitioners in The Canadian Legal Lexpert® Directory, and three have been elected fellows of the American College of Trial Lawyers.

The firm provides litigation and counsel services involving a wide range of disputes before all levels of court in Ontario and Canada, administrative tribunals, and arbitration panels. The core of the firm’s practice is significant civil and commercial litigation involving private and public businesses, financial institutions, and regulatory bodies. The firm also acts regularly as counsel in administrative proceedings, class actions, employment disputes, insolvency litigation, public law and constitutional issues, franchise issues, libel and slander actions, and health law litigation. The firm’s clients are based in Canada, the United States, and elsewhere.

Partner profiles are as follows:

C. Clifford Lax, QC, LSM, was called to the Ontario Bar in 1970, appointed Queen’s Counsel in 1982 and awarded the Law Society Medal in 2008. Fellow, American College of Trial Lawyers. Fellow, International Academy of Trial Lawyers. Past President of The Advocates’ Society. Arbitrator, International Centre for Dispute Resolution (AAA). Arbitrator, the Chartered Institute of Arbitrators. Member, Toronto Commercial Arbitration Society. Member, American Dispute Resolution Center. Past National Chairman, Environmental Law, CBA. Past Provincial Chairman of American College of Trial Lawyers. Wide range of experience in major litigation and arbitration work, spanning all fields with emphasis on complex corporate commercial and securities disputes, real estate transactions, environmental liability and defamation. Languages: English and French.

Terrence J. O’Sullivan, LSM, was called to the Bar of Ontario in 1973. He has a wide-range of experience in major civil and commercial litigation with particular emphasis on complex corporate, commercial, securities and financial institution litigation. He regularly appears in all levels of courts in Ontario and other provinces, and the Supreme Court of Canada. He also acts as a mediator and arbitrator.  He is a Fellow of the American College of Trial Lawyers, a Fellow of the International Academy of Trial Lawyers and is a Past President of The Advocates’ Society. He is a member of the Chartered Institute of Arbitrators. Mr. O’Sullivan was awarded the Law Society Medal for his contributions to the profession in 2010.  He is recommended by all leading professional recognition publications as one of the leading civil litigation counsel in Canada and is ranked in Band 1 by Chambers Global.

Jonathan Lisus was called to the Ontario Bar in 1992. His practice focuses on complex commercial and constitutional litigation with particular experience in infrastructure related litigation, complex contractual disputes, product liability claims, oppression remedies, franchise litigation, class actions and securities litigation. He has a trial and appellate practice in the Superior Court of Justice, the Ontario Court of Appeal and the Supreme Court of Canada. Member of the Chief Justice of Ontario’s Advisory Committee on Professionalism, former Director of The Advocates’ Society, regularly appears as Special Counsel for the Canadian Civil Liberties Association. Recognized by The Lexpert®/American Lawyer Guide to the leading 500 Lawyers in Canada, Lexpert® — Most Frequently Recommended, Martindale-Hubbell preeminent rating (5), Chambers Global, and The Best Lawyers in Canada. Fellow of the American College of Trial Lawyers and Fellow of the International Academy of Trial Lawyers.

Matthew P. Gottlieb practises business litigation, including corporate and commercial disputes, insolvency and restructuring mandates, libel law, securities litigation and administrative law. He has appeared before the Supreme Court of Canada, the Ontario Court of Appeal, the Ontario courts (Superior Court, Commercial Court and Divisional Court), the Federal Court of Canada, the New Brunswick Court of Appeal, the Supreme Court of British Columbia, The Law Society of Upper Canada, the Ontario Securities Commission, and the Toronto Stock Exchange. Has acted as counsel in many major court proceedings, including those regarding Nortel, Hollinger Inc., BlackRock, Air Canada, First Leaside, Cineplex Odeon and has significant experience in trials and court applications involving insolvency, securities, contractual, Internet and technology, and shareholder issues. Recognized as a leading litigation lawyer in Chambers Global: The World’s Leading Lawyers for Business, Benchmark Canada, The Best Lawyers in Canada and The Canadian Legal Lexpert® Directory. Frequent instructor at many litigation related seminars held by The Law Society of Upper Canada, The Advocates’ Society and other organizations. Called to Ontario Bar in 1991.

Eric Hoaken’s litigation practice is primarily focused on class proceedings but also includes health law matters and complex commercial litigation such as shareholders’ disputes, directors’ and officers’ liability issues and contractual disputes. In class proceedings matters, he has appeared in Ontario, Saskatchewan and British Columbia courts on behalf of parties to securities, price fixing, consumer services, tax, pension and product liability actions. He has published on a variety of subjects relating to class actions and is an Adjunct Professor at Western University in London, Ontario where he teaches the Class Actions course. He has appeared in all levels of court on a wide variety of complex commercial litigation cases and before a broad array of administrative tribunals in health, energy and securities-related proceedings. He is a Fellow of the International Academy of Trial Lawyers and has been recognized as a “Litigation Star” for Class Actions and Litigation by Benchmark Canada and by The Best Lawyers in Canada for Class Actions. He frequently lectures and teaches on a variety of litigation and advocacy-related topics. He was called to the Ontario Bar in 1994.

Rocco DiPucchio, called to the Ontario Bar in 1996; Director of The Advocates’ Society. Has practised exclusively in the area of civil litigation at the trial and appellate levels, with particular specialties in corporate and commercial litigation, defamation, professional liability, securities matters, shareholder disputes, administrative law, and employment litigation. He has acted as counsel before all levels of court, up to and including the Supreme Court of Canada, and also has substantial experience in mediation and arbitration matters, including having acted for various automobile dealerships in proceedings under the National Automobile Dealer Arbitration Program and having conducted lengthy arbitrations in a construction dispute in the Maritimes. He obtained a Bachelor of Laws from Osgoode Hall Law School in 1994 where he was the Gold Medallist, and completed a judicial clerkship with the Chief Justice of the Superior Court of Justice in Ontario in 1996 prior to entering private practice. In November 2010, Rocco was named by Lexpert® magazine as one of the “Leading Lawyers in Canada under 40”.

M. Paul Michell, called to the Ontario Bar in 1997. Practice focuses on commercial arbitration and litigation, cross-border litigation, oppression and shareholders’ actions, defamation, employment, appeals and judicial review. Has appeared in the Ontario and Federal courts, the Supreme Court of Canada, and a variety of administrative and arbitration tribunals. Law clerk to Mr. Justice Charles Gonthier of the Supreme Court of Canada. Adjunct Professor, Faculty of Law, University of Toronto, teaching international commercial arbitration and public international law. Fellow of the Chartered Institute of Arbitrators. Author of more than 25 articles in legal journals, including articles cited by the Supreme Court of Canada and the High Court of Australia. Ranked by Benchmark Canada, Chambers Canada, and Who’s Who Legal: Canada for arbitration and commercial litigation and “Consistently Recommended” for Litigation – Corporate Commercial by Lexpert®. Listed as “up and coming” Ontario dispute resolution lawyer in Chambers Global in 2009 and 2010. Named a “Top 40 Lawyer Under 40” by Lexpert® in 2006.

Shaun Laubman was called to the Ontario Bar in 2005 and the New York State and Federal Bars in 2006. He has a broad-based commercial litigation practice and has acted for clients in trials, appeals, applications and administrative proceedings. His litigation practice includes shareholder and partner disputes, securities litigation, insolvency proceedings, franchise law, directors’ and officers’ liability, and employment matters. Shaun clerked for the judges of the Ontario Court of Appeal following graduation from the University of Toronto Faculty of Law, where he was the valedictorian of his graduating class.

Hilary Book represents clients in a broad variety of commercial litigation matters. Her clients conduct business in multiple jurisdictions, and she has experience working with counsel across borders to develop and implement unified litigation and business strategies. Book has litigated questions of jurisdiction, choice of law and the enforcement of foreign orders, and has acted in shareholder disputes, breach of contract cases, real estate disputes, and bankruptcy and insolvency matters. Book has a particular interest in fraud cases, and has experience dealing with forensic accounting issues, orders freezing assets and serious civil contempt. She also has a growing practice defending manufacturers in several different industries from product liability claims. She has appeared as lead counsel at trials, motions and applications in the Ontario Superior Court of Justice, as well as on motions and appeals to the Ontario Court of Appeal. She a long-time volunteer with Pro Bono Law Ontario. Called to the Ontario Bar in 2006.

Paul Fruitman’s practice combines courtroom expertise and a focus on the unique features of each case. He has appeared as counsel in all levels of court in Ontario, including as trial counsel in jury and non-jury matters, and at the Federal Court and the Federal Court of Appeal and in a range of administrative and arbitral tribunals. He has extensive experience in injunctive proceedings involving restrictive covenants and use of confidential information. He regularly acts as counsel to corporate directors and officers and in shareholder disputes, oppression claims and professional negligence matters. He is a Member of the Ontario Bar Association’s Alternative Business Structures Task Force and the Canadian Bar Association’s working group for Solicitor-Client Privilege Claims at the Canadian border, and a past member of the OBA’s Civil Litigation Executive. Lectures regularly on litigation topics, including at The Advocates’ Society and the OBA. Called to the Ontario Bar in 2006. 

Daniel Schwartz’s growing practice focuses on assisting clients to solve complex disputes, including real estate, shareholder, estate, construction and engineering, defamation, professional liability, technology and procurement disputes. Daniel’s ability to thoroughly understand his client’s business, issues, and goals allows him to recognize dispute resolution strategies that others often overlook. Strongly literate in science, technology and finance, Daniel is a quick study in almost area of business in which his clients operate. Daniel regularly appears at all levels of court in Ontario and before arbitral tribunals, often as lead counsel. Daniel’s litigation experience is complemented by his work in the legal community. He is a past Chair of The Advocates’ Society’s Young Advocates’ Standing Committee and a frequent lecturer and skills instructor for other litigators. In 2016, Daniel was recognized by Who’s Who Legal: Canada as one of Canada’s leading lawyers for eDiscovery. Called to the Ontario Bar in 2006.

Andrew Winton has been involved in a wide range of commercial disputes, with a focus on employment, restructuring, and shareholder disputes. His clients include individuals, small- and medium-sized businesses, and major corporations. He acts for both employers and employees in executive terminations, with a focus on the financial industry, and has significant experience in departing employee cases involving unfair competition and misuse of confidential information disputes. He is the co-author of the “Injunctions against Ex-Employees” module on Lexis Practice Advisor Canada. Andrew regularly acts for parties to insolvency and restructuring matters, including as counsel to the court-appointed Monitor or Receiver, as counsel for the directors and officers of insolvent corporations, and as counsel for other interested parties. Andrew served on the Section Executive of the Ontario Bar Association’s Civil Litigation Section between 2013 and 2016 and on the Section Executive of the Ontario Bar Association’s Insolvency Section from 2016 to 2017. Called to the Ontario Bar in 2007.


145 King St W, Suite 2750
Toronto, ON, Canada, M5H 1J8
Phone: (416) 598-1744
Fax: (416) 598-3730

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Lax O'Sullivan Lisus Gottlieb LLP is a Lexpert-Ranked Firm in the following practice areas
Class Actions Toronto, Ontario Consistently Recommended
Litigation - Corporate Commercial Toronto, Ontario Most Frequently Recommended
Litigation - Securities Toronto, Ontario Consistently Recommended
Professional Liability Toronto, Ontario Consistently Recommended