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

1,039 Profile Views

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Alexis Klocko

Feb 03, 2026

Would recommend John Cassell for sure to anyone in Calgary needing legal help

I've already told all my friends and family about John Cassell. If you need Privacy and Data Security Law help in Alberta, they're the ones to see without any doubt. They are local experts who really...

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Lillie Kertzmann

Feb 03, 2026

Five stars for the incredible team at John Cassell in Calgary - they are amazing

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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Chris Moore

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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Willard Bruen-Ondricka

Feb 03, 2026

Would recommend John Cassell for sure to anyone in Calgary needing legal help

Everyone at John Cassell's office in Calgary was so nice and helpful. They made a tough situation a lot easier to deal with by being so patient and explaining everything clearly. I never felt like jus...

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Robin Keebler

Feb 03, 2026

So happy with the results of my case thanks to the hard work of John Cassell and staff

If you're looking for someone who actually cares and will fight for you, go to John Cassell. They helped me out big time with my Privacy and Data Security Law issue and kept me informed at every step...