About O'Donohue & O'Donohue

O'Donohue & O'Donohue is an established estates, trusts and wealth management law practice in Toronto, founded in 1951. The firm advises individuals, families and their businesses on estate planning, estate administration and estate litigation, along with related tax, corporate and real estate matters. It also handles business succession planning and family law. The firm keeps a network of domestic and foreign professional colleagues it partners with on a case by case basis, so clients working across more than one jurisdiction can draw on a wider range of skills.

The firm's principal, Stephen O'Donohue, is certified by the Law Society of Ontario as a Specialist in Estates and Trusts Law and was called to the Ontario and British Columbia bars in 1988 and 1991. Stephen's education includes a science degree, an MBA in finance and a law degree, and the practice covers estate planning, estate administration and estate litigation, including large and complex estates. The team also includes associate Lauren O'Donohue, who joined in 2023 after articling at Gardiner Roberts LLP, and two counsel lawyers, Jean M. DeMarco and Gregory R. Mallough, who bring civil and estate litigation, family law, corporate and real estate experience to the firm.

Milestones & recognition

  • O'Donohue & O'Donohue was founded in 1951 as a Toronto estates, trusts and wealth management practice.
  • The firm's principal, Stephen O'Donohue, is certified by the Law Society of Ontario as a Specialist in Estates and Trusts Law.

In the community

  • Associate Lauren O'Donohue founded Resilience Rally, a mental health not for profit organization, in 2019.

Good to know

A person using a wheelchairWheelchair accessible

This firm’s lawyers at a glance

Called to the bar
1984–1988 · median 40 years in practice 2 of 4 lawyers
Law schools
Osgoode Hall Law School (2) 2 of 4 lawyers

The neighbourhood

The firm's Toronto office is at 120 Adelaide Street West, part of the Richmond-Adelaide Centre, a cluster of office towers in the city's financial district. The tower at 120 Adelaide dates to 1966, and like most of the complex it connects to Toronto's underground PATH network, putting the firm within walking distance of the city's banks and other business offices, a fitting setting for a practice built around estate, tax and business work for individuals and their companies.

Frequently asked questions

What areas of law does O'Donohue & O'Donohue handle?
The firm focuses on estate planning, estate administration and estate litigation, along with related tax, corporate and real estate matters, plus business succession planning and family law.
Can O'Donohue & O'Donohue help prepare a will and powers of attorney?
Yes. Wills and powers of attorney are listed among the firm's practice areas, alongside its broader estate planning work.
Does the firm handle contested estates or will disputes?
Yes. Contested trusts and estates are a listed practice area, and counsel Jean M. DeMarco's practice includes estate litigation as well as general civil litigation.
Does O'Donohue & O'Donohue work with large or complex estates?
The firm describes extensive experience with large, complex estates, including cases involving estates valued over one billion dollars.
Can the firm help with business succession or setting up a company?
Business succession planning and corporate law are both listed practice areas, and counsel Gregory R. Mallough's practice focuses on business transactions and real estate law.
Where is O'Donohue & O'Donohue located and how do I reach the firm?
The office is at 120 Adelaide Street West, Suite 2107, in downtown Toronto. The firm can be reached by phone at 416-361-3231 or by email at mail@odonohue.ca.

Where to find them

2107-120 Adelaide St. W., Toronto, ON M5H 1T1 · 416-361-3231

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