Celebrating the Life Of

Tyrrell "Terry" Clark

April 19, 1950 - August 29, 2023

Proudly serving the Peel Region since 1978.

The Tannahill, Lockhart & Clark Law team has a combined legal experience of close to 150 years. We are proud of our history serving the legal needs of businesses and residents across Peel Region and of our reputation for personalized legal representation, caring and respect. When you work with our team, you can be confident in our ability to actively represent you and we always pursue the best course of legal action for your particular needs. You are not just another file at TLCL. We are a law firm that genuinely cares about the well-being of our clients.

Our Practice Areas

Wills and Estates

Our legal team has decades of experience in the area of Wills and Estates, and we provide our clients with a wide range of expertise for all of their estate planning needs. We work closely with our clients to develop comprehensive estate plans and the documents required to implement them. Our clients include individuals, estate trustees, financial institutions and trust companies.

Civil Litigation

For over 40 years our law firm has provided legal representation covering personal injury, estate litigation, wrongful dismissal, small claims, construction liens, commercial litigation and real estate litigation. Our knowledge and experience in all of these areas have provided solid results to our clients.

Estate Litigation

When a dispute arises between family members and estate beneficiaries, our legal team have the knowledge and experience to help our clients reach a fair and cost-effective resolution to the conflict.

Real Estate Law

We can help with residential purchases and sales, mortgages and financing, development and planning, and Applications for Absolute Title. We specialize in various forms of litigation, including real estate. Because when things go wrong with a real estate transaction, pending or otherwise, there is a critical, important role for a real estate litigation lawyer to play in areas such as commercial lease disputes, mortgage disputes or title disputes.

Business Law

Commercial leasing, purchase and sale, contracts, shareholder agreements, corporate re-structuring and charitable status registrations, are all areas of Business Law that we have significant experience and knowledge that benefit our clients.

Welcome-to-Our-Law-Firm-June-28-revised-version

Video about the law firm of Tannahill Lockhart & Clark Law LLP, Serving the Peel Region for over 40 years.

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In this video, Douglas Tannahill, Senior Partner lawyer with Tannahill Lockhart & Clark Law, provides important information about the role and requirements of an Estate Trustee or Executor.

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Estate-Issues-to-Consider-June-28th-revised

In this video, John Lockhart, Senior Partner lawyer with Tannahill Lockhart & Clark Law, and Timothy Lockhart, Associate with the firm, provides important information about the importance of having a Will when someone dies and the consequences of not having a Will.

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Why-You-Need-a-Lawyer-June-28-Revised-1-1

In this video, Timothy Lockhart, an Associate lawyer with Tannahill Lockhart & Clark Law, provides his insight and several examples as to why it is so important to have an experienced and knowledgeable lawyer involved in your Will and estate planning.

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Litigation-and-Real-Estate-June-28-revised

In this video, Timothy Lockhart, an Associate lawyer with Tannahill Lockhart & Clark Law, provides his insight into when an individual or business should consider hiring a real estate litigation lawyer, and cites examples about when and why that should be a consideration.

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challengin-a-will-june-29-is-it-too-large

In this video, John Lockhart, Senior Partner lawyer with Tannahill Lockhart & Clark Law, provides important information about when you need to consider challenging a Will or Power of Attorney and why that is important.

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Client Testimonials

I Am Very Thankful That Our Paths Have Crossed

John & Leilani, I would like to thank you both in helping manage my dad’s estate. It was a very difficult time for Alan and myself and with your help, guidance, and patience we were able to manage through everything. A special thanks to Leilani for all her work and especially her comforting presence anytime I met with her. I am very thankful that our paths have crossed and have developed a friendship that will continue.

Marianne & Alan Carvalho

Father's Estate

A Very Calming Presence and a Speedy Result for My Real Estate Deal

I retained the services of John Lockhart when a real estate deal I was involved with went bad. Mr. Lockhart was a very calming presence whom I was able to contact with ease. He took my calls and met with me and he explained my options clearly so that I could understand fully. He acted quickly and we achieved a speedy result. I feel very comfortable with Mr. Lockhart and trust his advice to be sound. I would and have recommended Mr. Lockhart to friends and colleagues.

Pranay Shah

Real Estate Transaction

I Appreciated Mr. Lockhart’s Honesty and Candor

I went to John Lockhart following a slip and fall accident needing to know if I had a case and what would be involved. He explained what to expect and that it could take 4 to 5 years to settle this case. I appreciated Mr. Lockhart’s honesty and candor during our first meeting, which continued for the duration of the case and to its settlement following mediation 4.5 years later. He and his litigation law clerk, Leilani, kept me updated and informed on every aspect of my case through those years. I always felt comfortable approaching Mr. Lockhart or Leilani with any issues or questions I had, and they were always answered promptly.

Carolynne Atkinson

Slip and Fall Accident

Blog Articles

OTLA Blogs

Distracted Driving

February 6, 2020

Injured persons should seek advice from experienced trial lawyers regarding who is at fault for their accident. First, it was seat belts, then it was impaired driving, now, distracted driving. There are many forms of distracted driving that can arise in motor vehicle accident litigation. During the...

OTLA Blogs

Compensation for Injured Airline Passengers in an International World

February 5, 2020

What happens when passengers are injured or worse, killed during the course of international air travel? With over 90,000 flights taking off every day around the world and billions of passengers flying internationally every year, aviation technology has come a long way since the Wright brothers. Unfortunately,...

OTLA Blogs

What is a Litigation Guardian? Who Needs One? Should I be One?

January 6, 2020

Becoming a litigation guardian is a significant responsibility. If you are considering acting as a litigation guardian, you should consult an experienced lawyer. Who needs a Litigation Guardian? Unfortunately, serious injuries can happen to anyone, including individuals who would legally be considered...

OTLA Blogs

Recreational Trails And Non-Urban Property Use: “Risks Willingly Assumed”

November 4, 2019

The Occupiers’ Liability Act informs the duty of care of owners of these types of properties. Imagine that it is a beautiful fall day, and you decide to go for a bike ride before the weather cools down. Cycling in a nearby wooded area, commonly used by your neighbourhood for outdoor activities, imagine...

Case Studies

Personal Debts : Recovery of a Cash Loan Without a Contract

June 29, 2019

Our clients, who we will call the Smiths*, were befriended by a man we will call Sam*. Sam got involved deeply in the Smiths’ lives, seeking to help them in matters of business, real estate, and spiritual matters. Sam gained the Smiths’ trust to point where they considered him a close friend and confidante. The...

Case Studies

Sibling Taking Advantage of Elderly Parent : Righting a Wrong

June 29, 2019

The client, who we will call Rosie*, suspected that her sister had been using a Power of Attorney to take money from her father’s account before he died. However, her sister was named as estate trustee under the Will and refused to provide any information. Rule 75.06 : Order to Compel InformationWe...

Case Studies

Eye Injury from BBQ

June 29, 2019

Our client, who we will call Doug, was cleaning the BBQ that he bought from a National Retailer one night. After about 20 seconds of cleaning the BBQ, some metal from the BBQ flew up into his eye. He went to the hospital that night and medical care providers removed a piece of metal from his eye. Another...

Case Studies

Greed and the Family Cottage

February 13, 2019

Our client, who we will call Bob* owned a family cottage property with his Aunt, with two cottages being on the same piece of land. Both Bob and his aunt enjoyed each other’s company and shared expenses of the joint piece of land over the years. The Greedy SonEventually, Bob’s aunt started to get older...

Our Team

Douglas D. Tannahill

Senior Partner

Doug Tannahill has practiced law in Brampton since being called to the bar in 1975. Doug completed his undergraduate degree at Ashland University in Ohio before taking his law degree at Osgoode Hall. He practices in the area of Corporate and Commercial law, with an emphasis in the area of Corporate and Commercial Agreements, including Commercial Real Estate and Leasing.

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John S. Lockhart

Senior Partner

John Lockhart was called to the bar in 1977, after taking his law degree at the University of Toronto, and his undergraduate degree at the University of Guelph. John started his career at the firm of West & Robb in Brampton where he met Doug Tannahill. They became partners in 1978.

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Tyrrell (Terry) Clark

Senior Partner

Terry Clark has been a lawyer since 1977. He took his undergraduate degree at McMaster University and graduated from the University of Toronto Law School in 1975. After his call in 1977, Terry worked in the City Solicitor’s Office at the City of Mississauga until 1981, working solely in the area of Municipal Law and Land Development.

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Timothy S. Lockhart

Associate

Tim was called to the bar in 2013 and has a broad-based civil litigation practice, including estate litigation, real estate litigation, commercial litigation, and construction lien actions. Tim’s non-litigation practice includes commercial and residential real estate, wills and estates, and charity law. Tim uses a personal touch with all his clients and is always personally available to take clients through the legal process step by step.

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Olga Wagner

Office Manager

Olga Wagner has been with Tannahill Lockhart & Clark since 1988. Olga began her career with the firm as our receptionist. Her professional manner and engaging voice and smile have been long time attributes to the TLC Family. In 2007 Olga became the Office Manager, continuing to manage the telephone and reception area while carrying out the day to day maintenance of the office.

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Leilani Hawkins

Senior Law Clerk, Litigation, Wills and Estates

Leilani Hawkins is a Senior Law Clerk who has been with our firm since 1991. She works in the areas of Litigation and Wills and Estates. After attending Ryerson in their Business Management Course, Leilani began her career in Toronto, and came to work with Tannahill, Lockhart & Clark when she relocated to Brampton, and then Georgetown with her husband and children.

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Sonja Syme

Senior Law Clerk, Real Estate/Wills and Estates

Sonja is a Senior Law Clerk at Tannahill, Lockhart & Clark and is responsible for significant commercial and industrial sales and purchases, land development projects and the purchase and sale of large tracts of vacant land. She also processes the sale of homes in residential subdivisions for home builders whom we represent.

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Eleanor Mairs

Senior Law Clerk, Real Estate/Wills/Estates

Eleanor Mairs joined Tannahill, Lockhart & Clark in 1994. After graduating from Sheridan College, Legal Secretarial Program, Eleanor worked in the legal field prior to joining our firm. Eleanor is the legal assistant to Douglas Tannahill and is responsible for Corporate and Commercial matters, Real Estate and Wills and Estates.

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