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

1,042 Profile Views

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Marshall Olson

Feb 03, 2026

A huge weight off my shoulders thanks to the amazing work of John Cassell

Just wanted to say a huge thanks to John Cassell and the staff. They really went above and beyond for me and my family during a very difficult legal battle. We couldn't have done it without their cons...

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Sam Williamson

Feb 03, 2026

Professional service and clear communication provided by John Cassell in Calgary

It's hard finding a reliable lawyer these days, but John Cassell in Calgary is definitely one of the good ones. Would use them again if needed without hesitation. They are professional, responsive, an...

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Craig Bergstrom

Feb 03, 2026

Many thanks to John Cassell for the hard work and dedication to my legal matter

Really glad I found John Cassell for my case. They were a huge help and made everything understandable. I was very impressed with their knowledge and how they handled the opposition. If you're in Albe...

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Andy Boyer

Feb 03, 2026

Top notch experts in Calgary - John Cassell is by far the best lawyer I've ever had

John Cassell is fantastic and very professional. Don't hesitate to hire them if you're in Alberta and need help. They really know their stuff and will go the extra mile to make sure you're taken care...

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Cameron Schaden

Feb 03, 2026

Absolutely Great! I couldn't be happier with the service from John Cassell

Super helpful and professional staff at John Cassell's office. Thanks again for everything you did for me! It was a long journey, but you made it much easier with your constant support and legal exper...