Atty. Mark D. Penner
As a patent and trademark lawyer Toronto-based, Mark D. Penner’s practice focuses on all aspects of the acquisition, protection, enforcement and strategic use of a wide range of intellectual property assets in Canada and around the world.
Intellectual Property Law Attorney · Serving Mississauga, ON
Profile Summary
About Mark D. Penner at a Glance
Mark D. Penner is a real estate and ip attorney based in Mississauga, Ontario, practicing at Cassels Brock & Blackwell LLP. Recognitions include Best Lawyers in America — Intellectual Property Law (2026). Serves clients in Mississauga, ON and the surrounding metropolitan area.
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About Mark D. Penner
- As a patent and trademark lawyer Toronto-based, Mark D. Penner’s practice focuses on all aspects of the acquisition, protection, enforcement and strategic use of a wide range of intellectual property assets in Canada and around the world
- Acting for a range of clients, from individual inventors, start-ups and other early stage companies to large multinational companies, Mark provides strategic advice in a variety of technology areas, including biotechnology, chemistry, energy, social media, insurance, communications and digital marketing
- Mark regularly speaks and writes extensively on all aspects of intellectual property rights, particularly the commercialization of IP rights for start-ups as well as commercial matters for companies with respect to IP rights in national, cross-border and multinational commercial transactions
- He is frequently sought after by national and international media as a commentator on IP matters
Practice Areas Explained
Mark D. Penner's Areas of Legal Practice
Each practice area below reflects the types of cases Mark D. Penner handles, with a practical overview of what that area of law involves and how it may apply to your situation in Mississauga.
Real Estate Law in Mississauga
Real estate attorneys handle home purchases, sales, commercial transactions, title disputes, and landlord-tenant matters.
Mark D. Penner is one of 313,729 real estate attorneys indexed nationally. Browse real estate attorneys in Ontario →
Intellectual Property in Mississauga
IP attorneys protect inventions, brands, and creative work through patent prosecution, trademark registration, copyright, and trade-secret enforcement.
Mark D. Penner is one of 105,285 ip attorneys indexed nationally. Browse ip attorneys in Ontario →
Jurisdictional Context
Why Local Counsel Matters in Mississauga
Practicing law in Ontario. Legal matters in Ontario are governed by state-specific rules of civil and criminal procedure, statutes of limitations, and substantive law. Cases originating in Mississauga are typically filed in the local municipal court or the appropriate Ontario state district court, depending on subject matter and amount in controversy. An attorney licensed in Ontario brings working knowledge of local procedural deadlines, judicial practices in this venue, and the substantive law that applies to cases brought here. Out-of-state attorneys generally cannot represent clients in Ontario courts without local counsel or pro hac vice admission.
Mississauga Courts and Legal Process
Choosing a Mississauga-based attorney means your counsel already knows the local docketing timelines, preferred filing formats, and how individual judges typically rule on procedural motions — details that only come from practicing in this jurisdiction day after day. That local familiarity can translate to better strategy, faster filings, and fewer costly surprises.
Looking for additional Ontario attorneys? Browse all attorneys in Mississauga or all attorneys in Ontario.
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Professional Profile
Why Clients in Mississauga Choose Mark D. Penner
Selecting an attorney is one of the most consequential decisions you can make when a legal matter arises. Below are the core qualities that distinguish Mark D. Penner's practice in the field of real estate and ip.
Broad Practice Area Coverage
Covering real estate and ip, Mark D. Penner can address the full spectrum of a client's legal needs without requiring referrals to separate specialists for each issue.
Local Presence in Mississauga
A Mississauga-based practice means Mark D. Penner attends hearings in the same courthouses, knows the local clerks, and understands the unwritten scheduling norms that affect every case filed here.
Case Types
Common Legal Issues Mark D. Penner Handles in Mississauga
Below is a representative sample of the types of matters Mark D. Penner has experience with under Ontario law. If your situation involves one of these case categories, this attorney may be well positioned to help you understand your options.
This list is illustrative, not exhaustive. Contact Mark D. Penner directly to discuss the specifics of your situation.
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How People Find Mark D. Penner Online
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Mark D. Penner's Practice Areas & Specializations
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