About Law Office of Deborah Herriot-Howes

The Law Office of Deborah Herriot-Howes is a solo family law practice led by lawyer and mediator Deborah Herriot-Howes, who has practiced family law exclusively since being called to the bar in 1996. Before law school, Herriot-Howes trained in music, earning a Bachelor of Arts (1980) and a Bachelor of Fine Arts (1983) from York University and an A.R.C.T. diploma from the Royal Conservatory of Toronto (1986), and ran a music school for several years before studying law at the University of British Columbia. The firm's current home page puts that at close to 30 years of family law experience, covering collaborative law, mediation, negotiation, and litigation for divorce and separation matters.

Herriot-Howes was appointed by the Office of the Children's Lawyer for Ontario in 2004 to represent children in custody, access, and child protection cases, worked as Family Law Duty Counsel at the Newmarket courthouse for Legal Aid Ontario, and later served as a Dispute Resolution Officer there. The practice was long based in historic Markham Village and now operates from Peterborough, Ontario, keeping its original 905 area code phone number. Clients arrange a personal appointment through Law Clerk Kerri.

Practice areas

Milestones & recognition

  • Deborah Herriot-Howes earned a Bachelor of Laws at the University of British Columbia and was called to the bar in 1996, beginning a career devoted exclusively to family law.
  • Earlier education included a Bachelor of Arts (1980) and a Bachelor of Fine Arts (1983) from York University and an A.R.C.T. diploma from the Royal Conservatory of Toronto (1986), following a prior career running a music school.
  • Appointed by the Office of the Children's Lawyer for the Province of Ontario in 2004 to represent children in custody, access, and child protection proceedings.
  • Earned a diploma as a family law arbitrator through the University of Waterloo in August 2007 and a diploma as a family law mediator in March 2010, becoming accredited by the Ontario Association for Family Mediation.
  • Appointed a Dispute Resolution Officer at the Newmarket courthouse, beginning those duties in January 2012.
  • The practice was long based in historic Markham Village before relocating to Peterborough, Ontario.

Good to know

A person using a wheelchairWheelchair accessibleA calendar with a checkmark beside a clockBy appointment

The neighbourhood

For years the practice was based in historic Markham Village, a heritage streetscape in downtown Markham, before its office relocated. The firm's mailing address is now in Peterborough, Ontario, a city on the Otonabee River about 125 kilometres northeast of Toronto and home to Trent University's main campus. Clients arrange a personal appointment through the firm's law clerk, and the phone number, still an area code 905 exchange, is unchanged from the firm's years serving Markham and York Region.

Frequently asked questions

Does the Law Office of Deborah Herriot-Howes handle divorce and separation cases?
Yes. The firm focuses exclusively on family law, including divorce, separation, and child custody and access matters, and has done so since 1996.
Can the firm act as a mediator instead of representing just one side?
Yes. Deborah Herriot-Howes holds a diploma as a family law mediator and is accredited by the Ontario Association for Family Mediation, in addition to a diploma as a family law arbitrator.
Has the firm represented children in custody or child protection cases?
Yes. Herriot-Howes was appointed by the Office of the Children's Lawyer for Ontario in 2004 to represent children in custody, access, and child protection proceedings.
Where is the Law Office of Deborah Herriot-Howes located?
The firm's mailing address is in Peterborough, Ontario. It was previously based in Markham and has kept its original 905 area code phone number since relocating.
How do I book an appointment?
The firm asks that you contact its law clerk to arrange a personal appointment.
How long has Deborah Herriot-Howes been practicing family law?
Since being called to the bar in 1996, which the firm's current home page puts at close to 30 years of family law experience.

Where to find them

3 Centre St, Suite 207, Markham, ON L3P 3P9 · 905-554-6155

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Listing compiled from the firm’s public website in September 2026. Verify licence status in the Law Society of Ontario directory ↗