J. Sébastien A. Gittens

Over the 20 years Tonii Roulston has been a member of the Calgary Bar Association, she has built her long-standing reputation as a tough criminal defence lawyer. Known for her strategic thinking, and effectiveness in the courtroom, she has represented a variety of challenging and high-profile cases. As a female lawyer, she holds an advantage in vigorously questioning female complainants on difficult details including their motivations to lie and inconsistencies in their accusations. Tonii is ...

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.

Steve Leitl's practice covers a broad range of commercial litigation matters, with an emphasis on securities, M&A, directors'/officers' liability, class actions and internal investigations. Mr. Leitl has conducted proceedings in the courts of Alberta, Ontario, Manitoba and Canada (Federal Court) and appeals in the Ontario Court of Appeal and Alberta Court of Appeal. He has conducted various regulatory proceedings before the Ontario, Alberta and Manitoba securities commissions and the Albe...

Katherine Ratcliffe is a trusted advisor to high-net-worth individuals, families, and business owners on their estate, trust, and tax matters. She develops sophisticated, client-centric planning strategies that reflect legal precision, practical insight, and a deep understanding of clients’ particular objectives. Katherine’s practice focuses on complex estate planning, trust and corporate structuring, business succession, and post-mortem tax planning. She regularly prepares bespok...

Perry R. Mack, K.C. is a top attorney recognized by Best Lawyers in the practice area(s) of Alternative Dispute Resolution, Appellate Practice, Bet-the-Company Litigation, Construction Law, Corporate and Commercial Litigation, Director and Officer Liability Practice, Insurance Law, International Arbitration and Personal Injury Litigation. Perry R., who practices law in Calgary, Alberta, has been recognized since 2006. This recognition is based on an exhaustive peer-review survey, reflecting t...

Justin Burt is a top attorney recognized by Best Lawyers in the practice area(s) of Real Estate Law. Justin, who practices law in Calgary, Alberta, has been recognized since 2025. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Justin is held by other top lawyers in the same geographic and legal practice area.

Aaron Martens, KC is a family law practitioner, mediator, arbitrator and Registered Collaborative Family Lawyer. He joined Dunphy Best Blocksom LLP in 1998 and is a partner in the firm. Aaron’s experience in family law matters includes being counsel on a wide variety of family and special chambers applications. He has represented clients in trials at Provincial Court and the King's Counsel, and has made appearances at the Court of Appeal of Alberta. Aaron also does adoption work. Aaron ...

Aaron Stephenson practises in the fields of insolvency and restructuring, commercial litigation and indigenous law. Mr. Stephenson advises all types of participants in insolvency and restructuring proceedings, both domestic and cross-border, including debtors, creditors, investors and insolvency professionals. His experience spans restructuring proceedings under the Companies' Creditors Arrangement Act, proposal proceedings under the Bankruptcy and Insolvency Act, plans of arrangement under c...

Doug is a senior family lawyer who has practiced family law for over 36 years. His practice is largely mediation and arbitration of family law disputes. Often Doug is acting as a mediator/arbitrator in a hybrid process that combines the benefit of both mediation and arbitration. In addition, Doug assists a few select clients in reaching resolution through negotiation, collaborative law, mediation, arbitration, and when necessary through litigation. Admitted to the Alberta Bar on January 10, 1...

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 ...