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Deirdre A. Sheehan Deirdre A. Sheehan

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Osler News August 6, 2025

Osler lawyers recognized in Lexpert Special Edition: Energy 2025

This prestigious publication highlights Canada’s leading lawyers in energy-related practices.

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Osler News April 30, 2025

14 Osler lawyers recognized in Lexpert Special Edition: Infrastructure 2025

Osler is pleased to announce that 14 of our lawyers are featured in the Lexpert Special Edition: Infrastructure 2025.

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Media Mentions January 8, 2025

The push for electrification – Alberta Law Review

In an article for the Alberta Law Review, authors Deirdre Sheehan, partner and Co-Chair, Regulatory, Indigenous and Environmental; Vivek Warrier,...

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Osler News September 25, 2023

22 Osler lawyers recognized in Lexpert Special Edition: Energy 2023

Osler is proud to announce that 22 of our lawyers are featured in the Lexpert Special Edition: Energy 2023, recognizing leading lawyers in the oil...

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Osler News February 22, 2023

Deirdre Sheehan joins Osler’s Regulatory, Indigenous and Environmental practice in Calgary as a partner

Deirdre Sheehan has joined Osler’s Regulatory team in Calgary with extensive experience in the regulatory and environmental aspects of electricity,...

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Osler is a leading business law firm practising internationally from offices across Canada and in New York. Our clients include industry and business leaders in all segments of the market and at various stages in the growth of their businesses. We have built our reputation on our commitment to our clients' success and the experience, expertise and collaborative approach for which we are recognized. We believe that our success is a reflection of our clients' success.