David Kolesar

Ray Chartier practises commercial litigation, arbitration and dispute resolution, focusing on matters involving the energy industry, major infrastructure projects and the transportation sector. He also advises a broad range of clients on indigenous law issues, and on environmental, social and governance (ESG) risks, regulation and compliance issues. Ray's clients include project proponents, financial institutions and other stakeholders. Over the years, Ray has been involved in pipeline applic...

Regina Corrigan is a partner in the Calgary office of the firm, head of the office's Business Law Department and practice group leader for its Intellectual Property Law Department. Regina's practice focuses on the areas of trademarks and technology commercialization. She has significant experience with all aspects of trademark law, including, prosecution, opposition, licensing and rights transfer in Canada. Regina also holds in-depth expertise in the commercialization and development of techn...

Jeffrey Coles is a top attorney recognized by Best Lawyers in the practice area(s) of Intellectual Property Law. Jeffrey, who practices law in Calgary, Alberta, has been recognized since 2022. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Jeffrey is held by other top lawyers in the same geographic and legal practice area.

Brent focuses his practice on business and personal tax planning, leading projects for restructuring, split-ups, acquisitions, asset divestitures and financings. He represents clients in tax disputes, representing clients before the Canada Revenue Agency, Department of Justice and Department of Finance. From the Alberta Government to the Institute of Chartered Accountants, Brent has worked with a variety of government, industry and volunteer organizations to improve tax laws. For the past 30 ...

Carsten is a founding member and senior partner of JSS Barristers, the largest civil litigation boutique law firm in western Canada. His practice emphasizes complex and multi-party corporate and commercial litigation, commercial class actions, oil & gas litigation including royalty, environmental and CAPL issues, shareholder disputes, advising creditors and others in insolvency matters and professional negligence claims. During a leave of absence from JSS Barristers, he served as Senior L...

Paul Pidde is a top attorney recognized by Best Lawyers in the practice area(s) of Corporate and Commercial Litigation and Insurance Law. Paul, who practices law in Calgary, Alberta, has been recognized since 2026. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Paul is held by other top lawyers in the same geographic and legal practice area.

Greg has successfully litigated a wide variety of civil litigation matters and commercial litigation matters including energy related matters. Greg’s trial and appeal experience is extensive and he has appeared before every level of court in Alberta. Greg has also appeared before several administrative tribunals. He has been involved in the resolution of numerous disputes, using mediation, judicial dispute resolution and other ADR forums. Greg became a partner in Parlee McLaws in 1990. ...

Tim Ryan is a partner in Gowling WLG's Calgary office. He practises actively in the area of health law, professional regulation and professional liability. Tim's practice includes class action proceedings, administrative law and the defence of medical, pharmacist and engineering malpractice cases. He also has an interest in public and private international law matters. While at Cambridge, Tim concentrated his studies in public and private international law, including studies at the Lauterpach...

Katharine Zhang is a top attorney recognized by Best Lawyers in the practice area(s) of Trusts and Estates. Katharine, who practices law in Calgary, Alberta, has been recognized since 2026. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Katharine is held by other top lawyers in the same geographic and legal practice area.

Colleen Abel is a corporate and commercial lawyer in our Calgary office, with a practice that primarily focuses on energy and natural resources. In addition to her energy practice, Colleen also has broad experience in providing general advice and assistance to clients across a variety of industries, including financial, consumer goods and technology, and provides support to clients and our team in relation to M&A employment matters. She has extensive experience in interpreting, preparing ...