John Mastoras

John Mastoras

(416) 216-3905
(416) 216-3930
222 Bay St, Suite 3000, Toronto, ON
Year called to bar: 1989 (ON)
John Mastoras is a senior partner in the Canadian employment and labour law group and acts exclusively for employers. He is known to clients as a passionate and dedicated labour lawyer. He regularly litigates and provides strategic advice in connection with labour arbitrations, labour relations board disputes, collective bargaining negotiations, human rights proceedings, occupational health and safety charges, workplace insurance, labour injunctions, and common law employment actions. His practice spans union and non-union workplaces for both federally and provincially regulated employers. He is often chief spokesperson in collective bargaining and provides helpful counsel in this regard to a variety of employers. He also routinely acts for a number of employer associations and provides innovative and practical advice to the associations and their members. He is frequently called upon to litigate highly contentious matters such as disruptive labour disputes and workplace mental health issues in various industries, including energy, pulp and paper, pharmaceutical, healthcare, insurance, long-shoring, retail, food processing, transportation, steel, building services, technology, automotive, and manufacturing more generally.
John Mastoras is a featured Leading Lawyer in:
Canadian Legal Lexpert Directory
Repeatedly Recommended
Canadian Legal Lexpert Directory
Repeatedly Recommended