Marion Williams Law
1 lawyer · City of Toronto
One of 2,345 law firms listed in Toronto, and one of 195 handling Intellectual Property.
About Marion Williams Law
Marion Williams Law is a small practice focused on international business law and intellectual property. Its work centers on registering and licensing patents, trademarks, and copyrights, and on forming and registering international business corporations in major financial centers. The firm's principal, Marion Williams, holds an LLB (Honours) from the University of London and has been licensed to practice as a CARICOM lawyer since 1992. Williams belongs to the Licensing Executive Society in the United States and Canada as well as its international body, and has contributed writing to the International Financial Centres Yearbook and to Euromoney.
The firm operates through a network of onshore and offshore legal and financial professionals rather than a single large office. A partner, Amoresio Antonio de Oliveira, brings more than twenty years of experience in Brazilian mining law, having served as chief legal consultant to Mineratins and Metamat in Brazil while also holding a university professorship. Between them, the practice covers licensing and technology transfer agreements, franchising, joint ventures, mergers and acquisitions, IP litigation, and project finance for developments such as hotels, resorts, energy projects, and infrastructure.
Practice areas
Milestones & recognition
- Marion Williams volunteers as Special Counsel for Lawyers Without Borders and received the organization's 2003 Gold Globe award, given in honour of attorney Barry Gold of Albany, New York (1945-2002). Williams also serves as Lawyers Without Borders' UN ECOSOC representative for Latin America and the Caribbean.
- The firm published a paper on emerging international financial centers in the International Financial Centres Yearbook 2007/2008, and one on Middle Eastern sovereign wealth funds in the Project Finance Yearbook 2008/2009.
- Partner Amoresio Antonio de Oliveira holds a university professorship and has advised Brazilian mining, agricultural, and cooperative organizations in addition to the firm's work.
Good to know
Wheelchair accessibleWho handles what
Frequently asked questions
- What areas of law does Marion Williams Law handle?
- The firm focuses on international business law and intellectual property: registering and licensing patents, trademarks, and copyrights, and forming and registering international business corporations.
- Can Marion Williams Law help file a patent application in another country?
- The firm works with the Patent Cooperation Treaty framework, which lets a single application filed with the World Intellectual Property Organization extend patent protection into multiple countries.
- Does the firm help set up an international business corporation?
- Yes. Marion Williams Law forms and registers international business corporations in major financial centers, coordinating with legal and financial professionals in each jurisdiction.
- Is project finance part of the firm's practice?
- Yes. The firm's work includes financing structures for developments such as hotels, resorts, energy projects, infrastructure, toll roads, and recycling initiatives.
- What languages can I get service in?
- The firm's website offers an English version and a Spanish version.
- Where is Marion Williams Law's Toronto address, and is it a physical office?
- The firm's Toronto contact point is a post office box at 1421 Yonge Street. Clients reach the firm by phone or email rather than an in-person office visit.
Where to find them
P.O. Box 69055, 1421 Yonge Street, Toronto, Ontario, Canada, M4T 3A1
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Wills, Estates & TrustsListing compiled from the firm’s public website in August 2026. Verify licence status in the Law Society of Ontario directory ↗