John Mastoras is the Toronto chair of our Canadian employment and labour law group. He is known to his clients as a passionate and dedicated advocate and business partner who provides innovative and practical advice.
John is frequently called upon to litigate highly contentious matters such as disruptive labour disputes and workplace mental health issues, and acts exclusively for employers in the broader area of labour and employment law. He regularly provides representation and advice in connection with grievance arbitrations, labour relations board disputes, human rights proceedings, occupational health and safety charges, workers’ compensation, labour injunctions and common law employment actions. His practice spans unionized and non-unionized workplaces for both federally and provincially regulated employers.
John has litigated on behalf of and provided strategic advice to a broad group of employers and employer associations in various industries, including energy, pulp and paper, pharmaceutical, health care, insurance, long-shoring, construction, food processing, transportation, steel, automotive and manufacturing more generally. He is often in the forefront as chief spokesperson in collective agreement negotiations and provides helpful counsel in this regard to a variety of employers.
For the past 19 years, John has taught at the University of Toronto’s Centre for Industrial Relations and Human Resources, where he is an adjunct professor, and publishes frequently in all areas of employment and labour law. He is the recipient of the 2009 Morley Gunderson Prize conferred by the University of Toronto's Centre for Industrial Relations and Human Resources. The prize is awarded annually to a graduate of the Centre for Industrial Relations who combines outstanding professional achievement with significant service to the university.