About M & Company Family Law

M & Company Family Law is a family law firm headquartered in Toronto's Scotia Plaza on King Street West, with satellite offices serving the Waterloo Region and Windsor and Essex County. The firm was founded by managing lawyer Anna-Marie Musson, who began a legal career on Bay Street and worked as a litigation partner at a national law firm before moving into family law. The practice focuses on divorce, separation, and marriage contracts for business owners, executives, and clients with complex financial holdings, including business valuation disputes, executive compensation, and generational wealth transfers.

The firm organizes its work across three groups, written advocacy, financial advocacy, and litigation, with each client assigned one lawyer who coordinates across them as needed. Its Financial Advocacy Group includes former Big Four accounting firm partners who work alongside the lawyers on financial disclosure rather than leaving that work to lawyers or paralegals alone. The firm also runs a separate Mandarin-language site for Chinese-speaking clients, staffed by members of the same team. Its work has been referenced in outlets including the Globe and Mail, the Financial Post, and Wealth Professional, and team members have been interviewed by CTV, CP24, and Breakfast Television.

Practice areas

In the community

  • One of the firm's senior counsel has taught family law courses at Fanshawe College.

Good to know

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

Fees & payment

A clipboard with a speech bubble and a no-charge dollar coinFree consultation

This firm’s lawyers at a glance

Called to the bar
2001 · median 25 years in practice 1 of 6 lawyers
Law schools
Osgoode Hall Law School (2), University of Ottawa, University of Windsor, Western University 5 of 6 lawyers

Offices 3

Scotia Plaza, 40 King St W, Suite 5705, Toronto, ON M5H 4A9

2557 Dougall Avenue, Suite 532, Windsor, Ontario N8X 1T5

40 King Street West, Suite 5705, Toronto, ON M5H 1A1

The neighbourhood

The Toronto office sits in Scotia Plaza on King Street West, where the firm's founder worked as a litigation partner before starting a family law practice.

The firm describes its Waterloo Region and Windsor and Essex County locations as satellite offices rather than full branches. One of the firm's senior counsel began a legal career in the Waterloo Region, practicing family and real estate law there before joining the firm. The Windsor office is a satellite location on Dougall Avenue in Windsor.

Frequently asked questions

Is M & Company a good fit for a simple, uncontested divorce?
Not necessarily. The firm's site says it isn't the right choice for clients looking for the fastest or least expensive route to a divorce, or for straightforward separations with no significant assets in play, and it points those clients toward other options.
Can M & Company help protect a business during a divorce?
Yes. The firm handles business valuation disputes, income characterization for incorporated professionals, and marriage contracts meant to protect business interests and generational wealth.
How does M & Company handle financial disclosure?
The firm's Financial Advocacy Group includes former Big Four accounting firm partners who work on financial disclosure directly with the legal team, rather than leaving that work to lawyers or paralegals alone.
Where is M & Company located?
The firm is headquartered in Toronto's Scotia Plaza on King Street West, with satellite offices serving the Waterloo Region and Windsor and Essex County.
Does M & Company offer services in Mandarin?
Yes. The firm runs a separate Mandarin-language site, staffed by members of the same team, for Chinese-speaking clients.
Does M & Company publish client testimonials?
No. The firm's site says it doesn't ask family law clients to share their experiences publicly, and instead offers confidential references upon request.

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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 ↗