Mang, Steinberg
2 lawyers · City of Toronto
One of 2,345 law firms listed in Toronto, and one of 579 handling Family Law.
About Mang, Steinberg
Mang, Steinberg is a small law firm with an office on College Street in Toronto, between the University of Toronto and Kensington Market. The firm takes its name from two founding partners, Ian Mang and Gary Steinberg. According to the firm's own site, archived in 2019, its practice covered family law, estate planning, real estate, and corporate and business law, the kind of mix that let a client handle a house purchase and a will with the same office instead of hiring separate lawyers for each.
Ian Mang spent 38 years appearing in trials and appeals at every level up to and including the Supreme Court of Canada, taught as an adjunct professor at Osgoode Hall Law School starting in January 2010, and provided mediation services through the Milton Family Court Mediation Project, before passing away in 2015. Gary Steinberg, the firm's other founding partner, practised real estate, estate planning, and corporate law, drafting documents ranging from agreements of purchase and sale to the share structure of a new corporation.
Practice areas
Milestones & recognition
- Founding partner Ian Mang was an adjunct professor at Osgoode Hall Law School from January 2010, teaching courses on children's law and child protection.
- Ian Mang was a member of the Alternative Dispute Resolution Institute of Canada and provided mediation services, including through the Milton Family Court Mediation Project.
- Michael G. Weissenborn earned an undergraduate degree from the University of Guelph in 1979 and a law degree from Osgoode Hall Law School in 1983, and joined the firm in 2001.
- Maddalena Fuller completed a Bachelor of Civil Law and Common Law at McGill University in 2010, was called to the Ontario Bar in 2011, and became an associate at the firm in 2014.
Good to know
Wheelchair accessibleThe neighbourhood
The firm's College Street office sits in the stretch of the street that forms the northern edge of Kensington Market and the western edge of the University of Toronto's St. George campus, right at the boundary of Chinatown. That part of College and Spadina has long been known for a cluster of computer and electronics shops and for a busy streetcar interchange.
Frequently asked questions
- Does Mang, Steinberg handle both real estate deals and wills at the same time?
- The firm's practice covered real estate transactions alongside wills and estate planning, so a client buying a home and updating a will could work with the same office rather than retaining separate lawyers for each matter.
- Can the firm help draft a shareholder's agreement for a small business?
- The firm's corporate law work included drafting shareholder's and partnership agreements and helping clients incorporate, organize, and later buy or sell a business.
- I'm a grandparent who wants access to my grandchildren after their parents separated. Can Mang, Steinberg help?
- The firm's family law practice included applications for grandparent access, on the view that children can benefit from staying in regular contact with a grandparent even during a custody dispute between the parents.
- Does the firm draft cohabitation agreements for common law couples?
- Yes. Family law work at the firm covered cohabitation agreements for couples living together, along with separation agreements and the division of family property.
- What is the story behind the Mang, Steinberg name?
- The firm was founded by two partners, Ian Mang and Gary Steinberg. Mang built a career in civil litigation, estate litigation, and family law, including mediation work and teaching at Osgoode Hall Law School, before passing away in 2015. Steinberg practised real estate, estate planning, and corporate law under the firm's original name.
- Where is the firm's office?
- An archived version of the firm's contact page listed the office at 340 College Street, Suite 225, Toronto, with a phone line reachable Monday to Friday during business hours.
Where to find them
340 College St., Suite 225, Toronto, Ontario M5T 3A9 · 416-531-4105
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Business & Corporate LawListing compiled from the firm’s public website in August 2026. Verify licence status in the Law Society of Ontario directory ↗