JMJ Workplace Investigation Law LLP
2 lawyers · Established 2013 · City of Toronto, York Region
One of 2,345 law firms listed in Toronto, and one of 478 handling Employment & Labour Law.
About JMJ Workplace Investigation Law LLP
JMJ Workplace Investigation Law LLP is a Toronto based law firm that has practiced exclusively in workplace investigations since it opened in early 2013. That focus made it one of the first law firms in Canada built entirely around impartial workplace investigations, rather than employment litigation or advice generally. Partners Jennifer MacKenzie and Monica Jeffrey bring more than fifty years of combined employment law and human resources experience to the practice, and both completed certification through the Association of Workplace Investigators (AWI) Training Institute in 2013.
MacKenzie practiced employment law at a small Toronto firm for nearly twenty years before co-founding JMJ, and holds an undergraduate degree in psychology. MacKenzie also co-authored two employment law books, Mediating Employment Disputes and the Human Resources Guide to Managing Workplace Harassment. Jeffrey was called to the bar in 2003 after articling at a national law firm and the Ontario Labour Relations Board, then practiced workplace law for close to a decade before co-founding JMJ. Jeffrey later served as Immediate Past President of AWI's Board of Directors and continues to teach and evaluate for AWI's Training Institute.
The firm investigates workplace harassment, discrimination, violence, and misconduct complaints for employers, in both unionized and non-unionized workplaces, and also conducts broader workplace culture reviews. Its work centers on staying impartial and at arm's length. JMJ has offices in Toronto and Richmond Hill.
Practice areas
Milestones & recognition
- JMJ Workplace Investigation Law LLP opened in early 2013 as one of the first law firms in Canada built exclusively around workplace investigations.
- Partner Jennifer MacKenzie co-authored two employment law books, Mediating Employment Disputes and the Human Resources Guide to Managing Workplace Harassment.
- Both partners completed the Association of Workplace Investigators (AWI) Training Institute in 2013.
- Partner Monica Jeffrey served as Immediate Past President of the AWI Board of Directors and continues as faculty and an evaluator for the AWI Training Institute.
Lawyers 2
This firm’s lawyers at a glance
- Called to the bar
- 2003 · median 23 years in practice 1 of 2 lawyers
Who handles what
Offices 2
The neighbourhood
JMJ's Toronto office is at 140 Yonge Street, inside the Dineen Building, a heritage designated structure built in 1897 for the W. and F. Dineen Company, a hat and fur manufacturer whose showroom and workshop once occupied the site. A 2012 renovation turned the building into a mixed use property, and its ground floor now houses the Dineen Coffee Co. The office sits at the corner of Yonge and Temperance, in the middle of Toronto's downtown business core, close to the kind of employers the firm's investigations serve.
JMJ also keeps an office in Richmond Hill, at 9225 Leslie Street, giving the firm a second point of contact for organizations in York Region without a separate downtown presence there.
Frequently asked questions
- What kinds of complaints does JMJ Workplace Investigation Law LLP investigate?
- The firm investigates workplace harassment (including bullying and sexual harassment), discrimination, violence and threats of violence, safety violations, retaliation, and toxic work environment complaints, along with matters like confidentiality breaches and conflicts of interest.
- Who retains JMJ, employees or employers?
- Employers retain JMJ to conduct impartial, third party investigations into workplace complaints in both unionized and non-unionized settings.
- Does JMJ only handle single complaints, or can it review a whole workplace?
- Beyond individual investigations, JMJ also conducts broader workplace culture assessments to help employers address ongoing conflict.
- How long has JMJ been doing this work?
- JMJ opened in early 2013 as one of the first Canadian law firms built exclusively around workplace investigations, and its partners bring more than fifty years of combined employment law and HR experience.
- Are JMJ's investigators trained specifically in investigation methodology?
- Both partners completed the Association of Workplace Investigators (AWI) Training Institute in 2013, and partner Monica Jeffrey continues to serve as faculty and an evaluator for that Institute.
- Where is JMJ located?
- JMJ has offices in Toronto, at 140 Yonge Street, and in Richmond Hill, at 9225 Leslie Street.
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Employment & Labour LawListing compiled from the firm’s public website in August 2026. Verify licence status in the Law Society of Ontario directory ↗