Aaron Grinhaus’ practice focuses on business law, tax and estate planning, including commercial transactions, corporate  reorganization, professional corporations and asset protection and securitization.
Mr. Grinhaus is also an experienced business, tax and Fintech consultant, who advises clients on Fintech strategies, including the use of Blockchain technology, smart contracts and cryptocurrency to reduce business costs, hedge institutional friction and expedite capital raises and cross-border wealth transfer transactions. He is a recognized Fintech expert, and is faculty at Osgoode Hall Law School’s “Blockchains, Smart Contracts and the Law” Certificate program. He is also the author of the textbook “A Practical Guide to Smart Contracts and Blockchain Law” (LexisNexis: 2019).
Mr. Grinhaus frequently gives presentations on a variety of business, Fintech and tax law related topics and has acted as chair, presenter and lecturer through a number of organizations including the Ontario Bar Association (OBA), RBC Dominion Securities, Osgoode Hall Law School of York University and Michigan State University College of Law, among others. He is also heavily involved in the legal community having served on the Governing Council and several section executive boards of the OBA for over a decade and having served as Director and General Counsel for several not-for-profit and charitable organizations.
Mr. Grinhaus holds law degrees from the University of Ottawa (LL.B.), Michigan State University College of Law (J.D.) and a Masters in Tax Law from Osgoode Hall Law School of York University (LL.M.)


Marisa is a business, real estate and estates lawyer with a focus on estate structuring, real estate and corporate reorganizations.

Marisa’s experience encompasses a broad range of estates and commercial issues, including asset and share sale transactions, securitization, estate administration, asset protection and corporate structuring and reorganization. She also regularly advises clients on estates, trust and real estate structuring, and frequently engages in contract negotiation and contract drafting for her clients. Marisa’s experience allows her to identify problems in commercial and real estate transactions before they occur making her a valuable advisor to any real estate or commercial investor.

In the community Marisa has actively promoted access to legal services by designing and conducting conflict resolution workshops, conflict-coaching and mediation at the Small Claims Court in low-income areas of Toronto. Marisa has also volunteered her time with the Pro Bono Canada Family Law project.

Marisa is conversant in English, Cantonese and Mandarin, and is active in the Chinese community.

In her spare time, Marisa likes to try new activities, travel, snowboard and perform music.

Marisa obtained her J.D. from Osgoode Hall Law School of York University, and prior to that, a Bachelor of Commerce degree (B.Com.) from the University of British Columbia with a specialization in Transportation and Logistics.


Bryan’s practice has a dual focus of business and family law. In addition to being able to provide valuable foresight into estates issues that come up in business, his unique experience allows him to identify and preempt family issues that may affect our business and corporate clients.

Bryan articled at a prominent civil litigation firm and subsequently took up residence as advisor to the CEO of a multi-national advocacy organization, addressing both business and constitutional issues. In that role he was also instrumental in litigation and alternative dispute resolution (ADR) proceedings. Immediately prior to joining Grinhaus Law Firm, Bryan was practicing in the areas of Real Estate, Estates, and Family Law at a boutique practice. His experience there drove him to focus on Family Law, having recognized the unique interplay between real estate, estates and corporate matters in the midst of family disputes.

Bryan is fluent in English and conversant in Hebrew.

In his spare time, Bryan loves to water ski, play basketball and is on a competitive level ultimate Frisbee team.

Bryan obtained his J.D. from the University of Windsor Faculty of Law, and prior to that, received a Bachelor of Arts degree in Psychology from the University of Western Ontario.


Blockchain Year in Review: The Late, but not great, 2018

By Aaron Grinhaus As the sun sets on 2018, I hear echoes of what optimists have been saying about cryptocurrencies over the past several years, that they are to blockchain what email is to the internet: the first use case, but certainly not the only...

Cryptocurrency regulation in Canada: Hurry up and…wait.

By Aaron Grinhaus [This article originally appeared in the October issue of Payments and Fintech Lawyer (Vol. 12:10)] In Canada, as in other jurisdictions, the approach regulators are taking to the cryptocurrency environment has been highly criticized for being slow...

5 Reasons Why Your Corporation Needs a Shareholder Agreement

By Marisa Lau and Aaron Grinhaus Starting a business can be risky, but when you have a dream, a plan and goals, optimism cuts through the anxiety that risk can bring. That optimism though also blinds people to the risks that...

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