Derek J. McCallum

Sarah Boulby of Boulby Weinberg LLP is a seasoned family law lawyer with over 30 years of experience. She advises clients in Ontario and globally on complex support, property, and parenting matters. Sarah is skilled in negotiation, litigation, mediation, and arbitration, providing comprehensive legal representation. Sarah is a sought-after speaker and writer on family law topics. Her expertise has been recognized by the Law Society of Ontario, which uses her educational materials in its licen...

Tom Whitby’s construction litigation practice is focused primarily in the area of professional negligence. In over 25 years at Miller Thomson, Tom has litigated on behalf of architects and engineers in all types of construction claims including fee disputes, bidding and tendering claims, architectural and engineering design negligence claims, construction deficiency claims, sustainable design claims, P3 claims, and delay claims. Tom acts for general contractors in litigation involving c...

Executive Summary Paul Stoyan is the Chairman of Gardiner Roberts and practises business law with a special emphasis on mergers and acquisitions, corporate finance and corporate governance. His varied experience makes him a valued corporate counsel to large and medium-size corporations of all types. He has worked extensively with various companies in the technology and financial sectors and has assisted such companies in various cross-border transactions, in going public and in establishing a...

Lionel Tupman is a top attorney recognized by Best Lawyers in the practice area(s) of Professional Malpractice Law and Trusts and Estates. Lionel, who practices law in Toronto, Ontario, has been recognized since 2024. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Lionel is held by other top lawyers in the same geographic and legal practice area.

Kathryn Kirkpatrick is Counsel and an experienced litigator in the Construction and Infrastructure and Insurance Practice Groups at Singleton Urquhart Reynolds Vogel LLP. Her extensive experience includes representing large institutional, private and municipal clients in diverse civil proceedings. She has represented clients in claims involving large multi-party construction projects; malicious prosecution, false arrest, negligent investigation, assault and breach of Charter rights; negligent...

Susan Rosen is a partner in the Real Estate and Financial Services groups at Gowling WLG and on the executive of Gowling’s Leasing and Real Estate National Practice groups. Susan brings her specialized understanding of leasing to a broad range of real estate, financial services and environmental law related areas, with an emphasis on commercial and retail leasing, secured financings, condominium law, commercial purchase and sale transactions, and environmental law. In her practice, she ...

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

Noah Kochman is a founding partner at Donovan Kochman LLP. His practice is focused on estates and trusts litigation as well as commercial litigation matters in Ontario. He regularly represents clients before the Court in power of attorney disputes, dependant support claims, will challenges, and other complex estates and trusts disputes. He is a fierce advocate for his clients in the courtroom, a skilled negotiator, and a thoughtful advisor. Noah's professional peers voted to recognize Noah as...

Huy Do is the Co-Leader of the firm’s Competition, Marketing & Foreign Investment group. His practice focuses on anti-trust/competition, marketing and foreign investment law. Huy is a widely recognized leader in Canadian competition, marketing and foreign investment laws. He is a Past Chair and member of the Executive of the Competition Law Section of the Canadian Bar Association and serves as a Non-Governmental Advisor to the International Competition Network, a network of antitrus...

Chris practices in the areas of labour law, civil litigation, and professional regulation/discipline. He is also a member of the firm's education and benefits law groups. Chris' labour and professional regulation/discipline practices focus on the representation of employees in all matters arising from their employment. This includes the representation of professionals before their regulators, as well as grievance arbitration and workplace human rights issues. In his civil litigation practice ...