Nicholaus De Koning

Laura Dickson is a lawyer recognized by Best Lawyers in the practice area of Personal Injury Litigation. Laura practices law in Hamilton, Ontario Best Lawyers has recognized Laura Dickson since 2025. The Best Lawyers recognition is based on a peer-review survey of lawyers in the same geographic region and legal practice area. The recognition reflects the professional regard in which Laura Dickson is held by other lawyers.

Sean was called to the bar in 1997 and has been practicing exclusively in the area of family law for more than 26 years. He has expertise in complex property and spousal/child support cases, marriage contracts and cohabitation agreements, and he brings a practical yet empathic approach to high conflict parenting cases. His expertise extends to married and unmarried spouses and to the LGBTQ+ community. Sean has successfully advanced matters in all levels of court in Ontario. In addition to res...

David Petras is a partner in the firm's Waterloo Region office. His practice focuses on domestic and cross-border mergers and acquisitions; debt and equity financing; licensing, distribution and strategic alliance arrangements; and electronic commerce and Internet issues. David’s clients include software developers, Internet-related companies, advanced manufacturers, computer products distributors, financial institutions, auto parts manufacturers, medical products companies and alternat...

Sean M. Sullivan is a lawyer recognized by Best Lawyers in the practice areas of Corporate and Commercial Litigation and Insurance Law. Sean M. practices law in Kitchener, Ontario Best Lawyers has recognized Sean M. Sullivan since 2022. The Best Lawyers recognition is based on a peer-review survey of lawyers in the same geographic region and legal practice area. The recognition reflects the professional regard in which Sean M. Sullivan is held by other lawyers.

Tom Manes represents mid- to large-size corporations and organizations in his accomplished corporate commercial practice. He provides help with a wide range of business matters, including leasing, mergers and acquisitions, and drafting and negotiating a variety of business agreements. He also has expertise in secured transactions, acting both for the lender and the borrower. Tom provides his broad range of clients with timely, practical, results-oriented counsel. He focuses on providing speci...

Radhika Vaidyanathan is a lawyer recognized by Best Lawyers in the practice areas of Corporate Law and Mergers and Acquisitions Law. Radhika practices law in Kitchener, Ontario Best Lawyers has recognized Radhika Vaidyanathan since 2025. The Best Lawyers recognition is based on a peer-review survey of lawyers in the same geographic region and legal practice area. The recognition reflects the professional regard in which Radhika Vaidyanathan is held by other lawyers.

Melissa Roth is a lawyer recognized by Best Lawyers in the practice area of Labour and Employment Law. Melissa practices law in Kitchener, Ontario Best Lawyers has recognized Melissa Roth since 2023. The Best Lawyers recognition is based on a peer-review survey of lawyers in the same geographic region and legal practice area. The recognition reflects the professional regard in which Melissa Roth is held by other lawyers.

Melissa Tummon provides legal advice in the areas of corporate law, finance and real estate. Melissa’s primary focus is on secured and unsecured lending for both lenders and borrowers and share and asset based transactions for corporations. She has experience acting for corporations of various sizes, including startups. Melissa’s practice includes: Financing and Lending: Acting for banks, private lenders and borrowers in secured and unsecured lending transactions, including real e...

Charles Gluckstein was called to the Ontario Bar in 1999 and is a Specialist in Civil Litigation, which encompasses personal injury , medical and professional negligence, motor vehicle claims , occupier’s liability issues , and product liability . An award-winning lawyer himself, Charles is known for his active support within the medical and disability communities and his innovative mindset for providing better and faster resolution to all Gluckstein client cases, without sacrificing ev...

A Partner in the firm, Sheryl joined Sullivan Mahoney LLP in 2019. In her employment practice, Sheryl provides timely strategic advice and perspective on all aspects of the employment relationship provincially and federally, including recommending and assisting in implementing effective measures to expediently manage and proactively address all types of workplace issues, negotiations and disputes. This includes negotiating executive compensation packages and employment contracts; drafting and...