James O'Sullivan

Gregory F. Peterson is a top attorney recognized by Best Lawyers in the practice area(s) of Corporate Law and Private Funds Law. Gregory F., who practices law in Calgary, Alberta, has been recognized since 2023. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Gregory F. is held by other top lawyers in the same geographic and legal practice area.

R. Travis Bissett is a top attorney recognized by Best Lawyers in the practice area(s) of Personal Injury Litigation. R. Travis, who practices law in Lethbridge, Alberta, has been recognized since 2025. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which R. Travis is held by other top lawyers in the same geographic and legal practice area.

A scholar, teacher and leader in the Alberta legal community, Rhoda I. Dobler’s practice spans two and half decades, and includes mediation, arbitration, collaborative law and litigation. Her positive attitude, compassion and creativity guide her conflict resolution approach, making her a valued mediator and arbitrator. An ardent believer in the importance of identifying new talent and mentoring junior lawyers, Rhoda teaches the Bar Admission (CPLED) course annually, and speaks at semin...

Tanya A. Frizzell is a top attorney recognized by Best Lawyers in the practice area(s) of Insurance Law and Personal Injury Litigation. Tanya A., 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 Tanya A. is held by other top lawyers in the same geographic and legal practice area.

Darren Hueppelsheuser’s practice concentrates on income tax law, with an emphasis on the tax aspects of financing and transaction planning for corporations and partnerships in both private and public transactions. Mr. Hueppelsheuser also advises on international tax structuring of Canadian inbound and outbound investments and the tax aspects of debt reorganizations and financial restructurings in creditor proceedings. Mr. Hueppelsheuser regularly presents on tax matters and has written ...

Crispin is the Administrative Partner of the Calgary office and practices in the areas of business law, corporate finance and securities, mergers and acquisitions, and energy. He advises clients on corporate finance, public and private M&A, corporate reorganizations, and governance matters across a range of industries, including oil and gas, oilfield services, mining, power, and manufacturing. Crispin has significant experience with corporate finance and securities transactions, including...

Mat Wirove is an accredited mediator and reputable family lawyer, recognized for his proficiency in court. With a prior background in civil litigation, Mat's versatile legal experience equips him to tackle a broad spectrum of family law matters with skill and efficiency. A Transparent, Client-Centred Approach Mat adopts a policy of openness and honesty with his clients, keeping them thoroughly informed about their case as it progresses. He understands the unique complexities of every situatio...

Andrew Koeman is a family law and divorce lawyer. Andrew graduated from the University of Calgary with a Bachelor of Laws (Juris Doctor) in 2009. He completed his articles with Alberta Justice and continued to work there for two years as a Crown Prosecutor in the Specialized Prosecutions Branch, focusing on complex economic crimes, before he decided to practice family law exclusively. While Andrew has experience in all areas of family law, he developed a practice with a specific focus on comp...

Gordon “Gord” Van Vliet is a partner in the firm’s Real Estate and Business practice groups with nearly 20 years of experience helping public and private developers build and manage many large properties throughout Alberta and British Columbia. He provides strategic counsel on a broad range of complex commercial real estate transactions and structures, including commercial and residential land development, sales and acquisitions, mergers, leasing and property management, co-...

Robert has extensive experience in oil and gas litigation and arbitrations, construction litigation, contract breach cases, First Nations governance, pension litigation and defamation actions, and he has represented clients in professional disciplinary matters before the Alberta Securities Commission, APEGGA, CREB and the Professional Conduct Committee of the Canadian Institute of Actuaries. He acts for a range of clients, from large corporations, pension funds and public institutions to indi...