Marie-Helene Mayer LLB/J.D. is a partner of Allen & Co. LLP, advising clients on a wide range of employment law matters.  Helping clients achieve their goals in a practical manner which is cost effective and strategic is the hallmark of Marie-Helene’s practice.

Marie-Helene acts for both employer and employee clients on matters such as employment agreements, hiring, terminations, disability, wrongful dismissal, human rights and workplace harassment.  She also advises clients on executive compensation, employee incentive plans, bonus entitlements, and on related regulatory matters. Marie-Helene is an experienced workplace investigator who, in her capacity as investigator, has conducted third-party investigations for large public sector organizations such as hospitals and school boards in both French and English.  Her areas of specialization are sexual harassment and workplace bullying.  

Marie-Helene has appeared before the Ontario Human Rights Tribunal and in Ontario Superior Court.  Prior to joining Allen and Co. LLP, Marie-Helene worked for an employment law boutique in Toronto. In addition to her private practice experience, Marie-Helene worked for a large financial institution, CIBC, where she advised client groups across the country on regulatory and compliance issues within human resources.

Known for her sense of humour and approachable writing style, Marie-Helene is a regular blogger for Her Magazine, an on-line publication, where she writes on employment law issues geared towards employers and employees alike. One of Marie-Helene’s blog posts, “Is Your Nanny Entitled to Paid Sick Days” recently appeared in the Huffington Post (November 2015). In addition to writing her regular blogpost, Marie-Helene has also spoken at the Six Minute Lawyer at the Law Society of Upper Canada and has conducted in-house training to private clients on harassment and discrimination in the workplace.  

Marie-Helene is the mother of two boys and has a special interest in child protection law, to which she devotes time on a pro bono basis.  In October 2013, she completed the certificate in Child Protection Law at the Law Society of Upper Canada.  She is an avid runner and cyclist and has competed in several half-marathons. 

Professional Associations & Volunteer Work

  • Law Society of Upper Canada (since 1998)
  • Ontario Bar Association - Labour & Employment Law Section
  • Association of Workplace Investigators
  • AJEFO Justice en français en Ontario
  • George Brown College - Sessional Lecturer - Employment Law for Paralegals


Phone:     416-977-6724 ext. 119



"I met Marie-Helene at an extremely fraught time in my life, having just been restructured after almost 20 years with my company.  Marie-Helene distinguished herself initially because of her responsiveness – she responded to my query within a couple of hours and made time for me within a couple of days.  Further, over and above the excellent work she did guiding me through the terrifying waters of negotiating a fair severance package, she treated me with grace and compassion, filled me with positivity about the future (not related to my package) and was a real confidence booster. 

She counseled me wisely, and helped me act on my own behalf to get a better package while not spending excessively on legal fees. I would not hesitate to recommend her." - AP (Toronto)