Mark D. Johnston, LL.B.





After receiving the Governor General’s Academic Medal for secondary school education in Cambridge in 1989, Mark Johnston attended the University of Western Ontario in London for his undergraduate studies, and then obtained his Bachelor of Laws from Osgoode Hall Law School in Toronto in 1994. He articled with the law firm of Sims, Clement, Eastman (now Miller Thomson LLP) in Kitchener prior to his call to the Bar in 1996.

Upon his call to the Bar, Mark joined Monteith Baker & Johnston and has practised with the firm continuously over the past 16 years. Mark’s practice is restricted principally to personal injury claims including motor vehicle accidents (including statutory accident benefit claims), medical malpractice, slip or trip and fall matters, short and long term disability, Canada Pension Plan Disability, assault and sexual assault, dog attacks, product liability, fire loss, insurance litigation and other civil tort claims.

Mark is a Trial Lawyer with significant court room experience and has appeared before all levels of court in Ontario, in both trial and appellate matters. He has been a guest speaker for the Ontario Trial Lawyers Association, and a contributor to The Litigator Magazine.

Mark lives in Newmarket with his wife Hilary and their six children. Mark’s interests outside of work include golf, fitness training and travelling.



Morin v. Korkola, (November, 2012) – Lead counsel at the Ontario Court of Appeal where the appeal of the trial Judgment by Dr. Korkola was dismissed, preserving the successful Judgment at trial. Click to review

Bennett v. Landecker, (November 2011) – Lead trial lawyer for successful action against an ophthalmologist for failure to diagnose a retinal detachment Click to Review

Morin v. Korkola, (March 2011) – Lead trial lawyer for successful trial action against an orthopaedic surgeon for failure to provide appropriate post-surgical care following a femur fracture Click to Review

Von Bismarck v. Sagl, (April 2002) – Punitive Damages award of $50,000 awarded at trial upheld by Ontario Court of Appeal Click to Review



"A car accident left my husband unable to work. The other side tried to blame my husband for the accident. We have children. We needed help. Mark Johnston came to our aid with knowledge, caring and a firm resolve to stand up to our opponent. His skill and hard work guided us to a very successful result."

– Kim Wick, Tottenham

"Mr. Johnston, thank you very much for your patient and instructive guidance through those long years of the meanderings through the legal system. We are at an age where it is almost back to infancy, and all through this experience, you, patiently and successfully, guided us and made us feel part of your family."

– Michael Bennett, Newmarket

"In recent years, I have been through litigation twice, with each concluding with mediation. The first process left me feeling completely deflated and basically let down by the lawyer representing me. I lost a lot of faith in the legal system. However, since that time, skeptical at the beginning of the second process, my faith was completely restored without doubt! Mark Johnston, who represented me, to put it bluntly was amazing! I felt completely empowered and supported throughout the whole process. None of my questions, concerns, or anything I wanted to ask Mark was any less important from one to another. He responded without hesitation about everything I asked him, and gave me the advice I needed to be reassured during this very difficult time. To top it all, Mark’s responses to me were often within hours, sometimes even minutes. Wow! I find it difficult to express how grateful I am for the caring, the compassion and leadership I was given by Mark Johnston and his assistant Leeann. I guess thank you both very much is a good start! It goes without saying that I would have no hesitation recommending someone to Mark."

– Richard P., Holland Landing

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