JMJ Workplace Investigation Law LLP


Specializing our legal practice in the evolving area of workplace investigation law.

About Us

Pursuant to legislation, employers are held accountable to an ever-increasing standard of “impartiality” in the investigative process. At JMJ Workplace Investigation Law LLP, that standard is greatly surpassed as our trained, skilled and experienced fact-finders maintain the requisite independence and objectivity at all times during the investigation.  Procedural fairness and integrity are ensured throughout the process as our findings depict a comprehensive analysis and reasoned conclusions.  Employers then have an effective tool upon which to make difficult but necessary decisions, which may have a significant impact in the workplace and in legal proceedings.


Get in touch

Employers want to be diligent in selecting the right investigator.  We would be happy to coordinate a call to elaborate upon JMJ’s investigative approach and methodology.

Book an appointment ▸


Workplace Investigators

Jennifer MacKenzie.jpg


Jennifer Mackenzie

Jennifer MacKenzie co-founded JMJ Workplace Investigation Law LLP in early 2013 after practicing employment law with a boutique Toronto law firm for nearly 20 years. 

Jennifer has conducted a wide range of workplace investigations, including investigating allegations of workplace harassment/bullying, sexual harassment, incidents of workplace violence, human rights violations and employee misconduct – in both the private and public sectors as well as in unionized and non-unionized workplaces.  Prior to co-founding JMJ Workplace Investigation Law LLP and restricting her practice to conducting neutral workplace investigations, Jennifer acted for a diverse group of employers and employees on a range of workplace matters.  The invaluable experience of providing legal representation on both sides of varied workplace matters, coupled with her undergraduate degree in Psychology, have provided Jennifer with a unique capacity to serve as a neutral workplace investigator.

Jennifer is the co-author of two employment law books, Mediating Employment Disputes and Human Resources Guide to Managing Workplace Harassment, both published by Canada Law Book.

Jennifer is a member of the Association of Workplace Investigators (AWI) and its Canadian chapter, CAWI, a not-for-profit organization focused on enhancing the quality of workplace investigations internationally.  She received a Certificate of Completion from the 2013 AWI Institute, a comprehensive & advanced training program emphasizing proven investigative techniques and related ethical issues. Jennifer currently serves as the Convenor of the Toronto Local Circle of AWI/CAWI.




Monica R. Jeffrey, AWI-CH

After being seconded to the Ontario Labour Relations Board during her articling term at a national law firm, Monica R. Jeffrey was called to the Bar in 2003.  For almost a decade afterwards, Monica practiced in the area of “workplace law” – representing and advising employees and employers in public and private organizations across multiple industries and sectors.  Monica developed an expertise in a diverse number of workplace matters including: sexual harassment, bullying, performance management, attendance and disability management, discipline and terminations, employment-related litigation, human resources policies, discrimination (human rights) and training.

In early 2013, Monica became passionate about improving the quality of impartial workplace investigations after receiving a Certificate of Completion from the 2013 Association of Workplace Investigators (AWI) Training Institute. Shortly thereafter, she co-founded JMJ Workplace Investigation Law LLP – one of the first law firms in Canada to practice exclusively in conducting impartial workplace investigations. Monica is a Board Director and Sustaining Member of AWI.  She was integrally involved in the development of AWI’s Canadian Chapter, CAWI, and has served as faculty and Chair at the Training Institutes for several years.  

Throughout her career, Monica has conducted workplace investigations, including those involving harassment (bullying), and sexual harassment, toxic/poisoned work environment, discrimination, retaliation and other types of misconduct (theft, fraud, breach of confidentiality and fiduciary duty).  More recently, Monica has investigated complex matters with multiple and anonymous complainants/respondents and reciprocal complainants, in highly politicized and/or sensitive environments.