Ranking tables
Energy: Oil & Gas (Regulatory) | Global
Canada
Rankings overview for Lawyers
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English (GB)
Dennis Langen Stikeman Elliott LLP6 Years Ranked
Lars H Olthafer Blake, Cassels & Graydon LLP15 Years Ranked
Martin Ignasiak Bennett Jones LLP8 Years Ranked
Sander Duncanson Osler, Hoskin & Harcourt LLP5 Years Ranked
Terri-Lee Oleniuk Blake, Cassels & Graydon LLP6 Years Ranked- Bernard RothDentons Canada LLP
- Laura EstepDentons Canada LLP
All Lawyers profiles
Senior Statespeople
S Randall W Block KC
Borden Ladner Gervais LLP | Energy: Oil & Gas (Regulatory)2026 | Senior Statespeople | 20 Years RankedRandall Block KC maintains a highly respected litigation practice, which sees him act on regulatory matters within the oil and gas space. Based in Calgary, he frequently represents major energy clients before the Canada Energy Regulator in proceedings and disputes relating to construction, supply and environmental damages.
Band 1
1 Dennis Langen
Stikeman Elliott LLP | Energy: Oil & Gas (Regulatory)2026 | Band 1 | 6 Years RankedHighlighted for his background in engineering, Dennis Langen routinely appears before regulators on oil and gas proceedings at the provincial and federal levels.
1 Lars H Olthafer
Blake, Cassels & Graydon LLP | Energy: Oil & Gas (Regulatory)2026 | Band 1 | 15 Years RankedLars Olthafer represents clients before energy regulators, demonstrating particular strength in land law matters arising from pipeline and project development. Utilising his background in engineering, the Calgary-based lawyer ably advises on a wide range of regulatory mandates arising from the oil and gas sector, including environmental compliance and First Nations consultation.1 Martin Ignasiak
Bennett Jones LLP | Energy: Oil & Gas (Regulatory)2026 | Band 1 | 8 Years Ranked1 Sander Duncanson
Osler, Hoskin & Harcourt LLP | Energy: Oil & Gas (Regulatory)2026 | Band 1 | 5 Years Ranked1 Terri-Lee OleniukBlake, Cassels & Graydon LLP | Energy: Oil & Gas (Regulatory)2026 | Band 1 | 6 Years RankedTerri-Lee Oleniuk is typically sought out for her regulatory expertise. Her environmental practice is complemented by her knowledge of energy regulation and Aboriginal law, particularly in relation to solar projects. She is based in Calgary.
Band 2
2 Alan Ross KCBorden Ladner Gervais LLP | Energy: Oil & Gas (Regulatory)2026 | Band 2 | 5 Years RankedAlan Ross KC is well regarded for his representation across provincial and federal regulatory mandates. He is particularly well versed in handling issues in the midstream sector and those pertaining to natural gas.
2 Brad GilmourOsler, Hoskin & Harcourt LLP | Energy: Oil & Gas (Regulatory)2026 | Band 2 | 15 Years RankedBased in Calgary, Brad Gilmour is well known for his experience in the environmental space, having guided a number of clients through investigations and site remediations.
2 Katie SlippBlake, Cassels & Graydon LLP | Energy: Oil & Gas (Regulatory)2026 | Band 2 | 3 Years RankedBased out of Calgary, Katie Slipp has a growing reputation for her counsel on regulatory proceedings and compliance matters in the oil and gas space.
Band 3
3 Jeremy Barretto
Cassels Brock & Blackwell LLP | Energy: Oil & Gas (Regulatory)2026 | Band 3 | 3 Years RankedJeremy Barretto of Cassels Brock & Blackwell LLP has a robust reputation for his regulatory and indigenous law practice, advising a number of major oil and gas clients on compliance and administrative challenges.