John Cassell

John Cassell

Privacy and Data Security Law Technology Law
Recognized in Best Attorney USA since 2026

About John

John Cassell is the Canadian co-head of our cybersecurity and data privacy practice. John assists clients with all manner of privacy and cybersecurity law issues including: responding to complex local and international cybersecurity incidents, advising on risk management strategies, assisting clients with access to information requests, complying with Canada's anti-spam legislation and proceedings before the offices of the Alberta and federal privacy commissioners.

John Cassell is the Canadian co-head of our cybersecurity and data privacy practice. John assists clients with all manner of privacy and cybersecurity law issues including: responding to complex local and international cybersecurity incidents, advising on risk management strategies, assisting clients with access to information requests, complying with Canada's anti-spam legislation and proceedings before the offices of the Alberta and federal privacy commissioners.

John Cassell is the Canadian co-head of our cybersecurity and data privacy practice. John assists clients with all manner of privacy and cybersecurity law issues including: responding to complex local and international cybersecurity incidents, advising on risk management strategies, assisting clients with access to information requests, complying with Canada's anti-spam legislation and proceedings before the offices of the Alberta and federal privacy commissioners.

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Reviews

4.5 / 5

40 Reviews

1,040 Profile Views

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Ronnie Tremblay-Reinger

Feb 03, 2026

So glad I called John Cassell to handle my Privacy and Data Security Law case in Calgary

I wasn't sure who to call for my Privacy and Data Security Law problem, but I'm so glad I went with John Cassell. They really listened to me and understood my situation. It was such a relief to have s...

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Maurice Douglas

Feb 03, 2026

John Cassell did a great job handling my complex Privacy and Data Security Law case from start to finish

Needed help with Privacy and Data Security Law and John Cassell delivered on their promises. They're professional, efficient, and easy to talk to. Good choice for anyone in Alberta looking for high-qu...

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Tasha Morar

Feb 03, 2026

Excellent legal representation provided by John Cassell for my Privacy and Data Security Law case

Best lawyer for Privacy and Data Security Law in Calgary. Period. I've seen others, but John Cassell is on another level. They truly care about their clients and work hard to get the best results. I a...

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Clay Trantow

Feb 03, 2026

So glad I called John Cassell to handle my Privacy and Data Security Law case in Calgary

John Cassell has been doing this since Recognized in Best Lawyers since 2026, and it definitely shows in their work. They're pros through and through and I wouldn't trust anyone else with my legal mat...

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Matt Smitham

Feb 03, 2026

Professional service and clear communication provided by John Cassell in Calgary

I appreciate how John Cassell handled my case. No fluff, just straight to the point and very effective representation for my Privacy and Data Security Law matter. They are obviously very experienced a...