Sonia Regenbogen

Partner Toronto, T: 647.777.8285 C: 416.508.6578 F: 416.862.8247

Hafssa Mahmood Assistant 416.862.8280 x 268


Bar admission

Law Society of Ontario


Harvard Law School, Mediator Training Program
University of Windsor, B.A.
University of Windsor, LL.B.

Membership and affiliations

Association of Workplace Investigators
Canadian Bar Association
Canadian Employers Council
Ontario Bar Association
The Advocates’ Society


Sonia Regenbogen has dedicated her practice for more than 15 years to representing employers in labour, employment and human rights law matters.  She works with employers through the process of collective bargaining, drafting employment agreements and policies, as well as defending employers before arbitrators, human rights tribunals, labour relations boards and the courts.  Sonia has extensive experience litigating complex cases involving claims of wrongful dismissal, sexual harassment, discrimination and disability issues.

In addition, Sonia is frequently retained to conduct independent workplace investigations into allegations of workplace harassment, discrimination and other employee complaints, and has been recognized by Who’s Who Legal as having a “top reputation” as a workplace investigator.  She also has extensive experience advising on the conduct of investigations, including the implementation of an investigation, decision making, report writing and communication of findings.

Since 2003 Sonia has represented Canadian employers at the International Labour Organization (ILO), a specialized agency of the United Nations. She is presently the Employer Spokesperson on the Application of Standards Committee at the ILO, a committee which supervises international labour standards on topics such as child labour and anti-discrimination to health and safety and working hours. Sonia sits on the board of the Canadian Employers Council (CEC).

Drawing on her experience with the ILO, she regularly advises both Canadian and multinational employers on a full range of cross-border and international labour and employment matters, including supply chain issues and codes of conduct.

Sonia has served as an adjunct faculty member at Queen’s University Faculty of Law where she taught Employment Law for more than a decade. She has also taught Employment Law at Osgoode Faculty of Law.  She has completed the Mediator Training Course at Harvard Law School and uses this training to assist her clients resolve even the most difficult disputes.

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