Our Accounting Firm

MDP Accounting Firm

With 3 decades behind us, MDP is one of Ontario’s leading accounting firms and among one of the top practices in Canada. MDP LLP is a full-service audit, tax, business advisory, and financial consulting firm with offices across Southern Ontario in Hamilton, Mississauga, and Oakville.

Established in 1992 and originally called Martyn, Dooley, & Partners, we deliver more than just traditional accounting services. Our team thrives on reducing tax liabilities, managing/planning growth, solving problems, easing the audit process, and preparing our clients for the future. Our practice is comprised of partners and certified professionals who have obtained their training and experience from the top national and international accounting firms.

Our objectives in establishing our accounting firm were that we believed our clients required a more efficient and direct service, quicker response times with personal as well as professional interests in their affairs and at a reasonable charge for the services provided.


years since we started.


plus experts employed.


plus happy clients served.


accounting firm partners.

The MDP Difference

The MDP client service philosophy has evolved from our understanding that each client is a unique organization with its own set of opportunities and challenges. We respond by drawing on our professional knowledge, our past experience with other clients, and our proven capabilities for creative problem-solving.

We believe that extensive partner involvement builds a mutually beneficial relationship. In most cases, clients receive personal attention from two of our partners: the engagement partner and the colleague partner.

The engagement partner is responsible for all aspects of the services rendered. The colleague partner becomes acquainted with key members of the client’s organization and becomes familiar with its operations, plans and objectives. In addition, a senior member from the MDP tax group is assigned to each of our clients to ensure that all tax planning opportunities have been explored.

This arrangement gives clients the added assurance of accessibility to partners and senior personnel with an additional layer of business maturity and good judgment.

Our Team

MDP LLP employs over 50 professionals across a magnitude of backgrounds. Our team is comprised of partners and certified professionals, many of whom have obtained their training and experience from major national and international accounting firms.

Partner Profiles

Our Clients

Our accounting firms’ track record of timely, expert financial advice has delivered desired results. We keep our promises and do exactly what we say we will do. Our clients thank us with their loyalty, and by referring us to their colleagues and business associates.

Clients tell us that working with MDP is both an enlightening experience and a genuine pleasure. We have enjoyed close working relationships with all of our clients for many, many years.

Learn more about our clients.

“Used MDP to coordinate setting up a new corporate structure with a business partner. They are excellent at recommending solutions, answering questions, & are always responsive.”
– Paul Pritchard

“Excellent service and advise on all Financial matters for over 8 years. MDP has looked after our accounts, Tax and GST for two companies, one bricks and mortar and one e-commerce”
– Bernie Williams

“MDP provided me an excellent service with a high level of professionalism. I would highly recommend them, especially Leslie. An exceptional experience to say the least.”
– Corey Scarfo 

“My husband and I are both entrepreneurs. We were both incredibly impressed with the staffs’ professionalism, accessibility and advice. MDP restored our faith in accountants! ”
– Liz Manore

Supporting Our Communities

MDP believes in giving back to our local communities. We are a proud supporter and sponsor of many not-for-profit organizations and charities across Ontario, including, but now limited to: