Our commitment and core values have endured since our founding in 1953.

Established more than 70 years ago, Sullivan Mahoney LLP is one of the oldest law firms in Niagara.

A proud history.

When Philip H. Sullivan and C. Hugh Mahoney sealed their partnership with a handshake in 1953, they set the cornerstone for a law firm that is now synonymous with the practice of law across Niagara and throughout Southern Ontario. At Sullivan Mahoney LLP, we are proud of our roots — where we’ve been, as well as where we’re heading.

From humble beginnings in a three-man office, the path to the present has seen Sullivan Mahoney LLP emerge as Niagara’s pre-eminent law firm, providing a full range of legal services via a team of more than 30 lawyers. Sixty-five years later, we are excited about the prospect of continued growth shaped by the same values established by our founding partners.

An enduring vision.

Tradition is sometimes described as a way of thinking or a way of doing things over time. At Sullivan Mahoney LLP it is about the way we practice law, and it is why we are a truly client committed firm.

The original partners set out to establish a law firm based upon hard work, integrity and an uncompromising commitment to clients. While the names on the doors of the Sullivan Mahoney Law Offices have changed with time, our adherence to this vision and these core values endures.

Our values and our commitment.

Our mission is to provide the highest quality legal service in a cost-effective manner with an uncompromising commitment to our clients.

  • Trust and Respect.
    We understand that trust and respect must first be earned, and then continually maintained. We are fully committed to doing so.

    Trust and respect, along with dignity, civility and professionalism are the foundation of our relationship with our clients, and with each other.

    Why? Because we care about our clients, and about each other.
  • Integrity.
    We are committed to the highest ethical standards in all aspects of our practice. This applies to our work for clients and to our relationships within our firm. This is not an expectation. It is a requirement.
  • Accountability.
    We work for and are accountable to our clients. We provide that accountability through communication, and by being accessible and responsive to client needs.
  • Excellence.
    We strive for excellence through continuous improvement, individually and collectively, in order that we may always be at the forefront of the profession and provide the highest quality legal service to our clients.
  • Teamwork.
    Working in a collaborative environment supporting and relying on each other professionally and personally is what we do in order to best serve our clients.
  • Unparalleled Client Service.
    Delivering a positive client experience through unparalleled client service is our commitment.