John Ottenheimer, K.C.

Melissa Roth is a top attorney recognized by Best Lawyers in the practice area(s) of Labour and Employment Law. Melissa, who practices law in Kitchener, Ontario, has been recognized since 2023. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Melissa is held by other top lawyers in the same geographic and legal practice area.

Lori Stoltz is a top attorney recognized by Best Lawyers in the practice area(s) of Medical Negligence. Lori, who practices law in Toronto, Ontario, has been recognized since 2026. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Lori is held by other top lawyers in the same geographic and legal practice area.

Kamil Umar is a commercial real estate lawyer based in Calgary. He takes a business-minded and market-driven approach to his practice, ensuring clients receive practical and thoughtful advice on matters including property purchase and sale, land development and land use planning, condominium and strata development, leasing of all asset classes, and financing and public infrastructure work. Kamil acts for diverse clients, including residential, commercial and industrial developers, privately a...

Donya is a corporate commercial lawyer and a shareholder of the firm. She joined the firm in 2014 and became a shareholder in 2021. Donya’s practice focuses on acquisition transactions with a focus on indigenous equity ownership and indigenous partnerships with industry. Donya is also the Alberta lead for the Indigenous Practice Group in the firm. Donya’s corporate commercial practice includes advising on business acquisitions, commercial arrangements and financing arrangements. S...

Paul Cabana’s practice focuses on tax law and covers both income tax and commodity taxes, including customs law. Paul advises both Canadian and foreign businesses in the course of their various transactions and current operations, as well as in the context of disputes with the tax authorities. He is regularly involved in mergers and acquisitions, corporate reorganizations, real estate transactions, audits, objections and appeals. Paul also helps employers navigate their tax obligations,...

David has been practising exclusively in the area of family law and child protection since being called to the Ontario Bar in 2014. David joins Frenkel Tobin having previously spent time at a boutique family law firm where he gained experience in all aspects of family law. Prior to his career in law, David worked in the financial industry as a mutual fund compliance officer. This experience provided him with a thorough understanding of financial instruments. David represents clients at all le...

Shanon is a governance and commercial lawyer with a primary focus on the health industry. With more than 40 years of experience, Shanon advises clients in private, not-for-profit and charitable organizations. Shanon helps clients understand the health regulatory landscape in Ontario and Canada, and the applicable laws in specific transactions. She advises boards of charities and not-for-profit organizations, foundations and other regulated entities with respect to their governance and corpora...

Rujuta Patel practises business law and competition law, with a focus on the resources and transportation sectors. She advises on private mergers and acquisitions, corporate reorganizations and restructurings of multinational and Canadian organizations, private placements and a variety of energy-related matters. She works regularly with energy services companies and is experienced in drafting, negotiating and advising on a broad range of services, drilling and engineering contracts. She also ...

Known for her strategic approach, honed advocacy skills, and breadth of tax knowledge, Becky Potter is a highly sought-after tax litigation partner at Thorsteinssons LLP. She has successfully represented her clients at every level of court both provincially and federally, including a landmark win at the Supreme Court of Canada. In addition to her in-court experience, she has extensive out-of-court experience negotiating favourable settlements for her clients. Becky is an active member of the ...

Gary Clarke, KC is a partner and Co-Head of the Employment & Labour Group nationally and Head of the Employment & Labour Group in Western Canada. Gary’s practice focuses on employment, labour relations, human rights and privacy law. He assists employers in both union and non-union environments with various human resources and labour relations issues including: drafting employment agreements, compensation schemes, workplace policies, restrictive covenants and non-disclosure agree...