MEET THE TEAM
JOHNNY CORNER
Owner/Operator, ISA Certified Arborist
Johnny graduated from the Georgian College Pre-Service Firefighting Program in 2010 and spent the next 8 years looking for the right opportunity. Now an ISA certified arborist, he has impressed his previous employers, teachers, and clients with his work ethic and honesty.
Johnny has always been the kind of guy who spent most of his free time thinking about work, and that’s why he is so excited about Northshore. It’s a chance for him to build something of his own. For him, that means treating this as an extension of his family – allowing him to provide for them but also making sure his teammates can provide for theirs as well; caring for his clients like family, not just customers; and modelling the character he hopes to see in his children by conducting business with integrity. Because if you’re going to spend half your life at your job, why waste it doing “just a job”? Johnny and the rest of the Northshore team are fully committed to intentionally investing their time wisely, and because we want to make the most of our time, you can trust that we won’t waste yours.
JESSIE CORNER
Office Administrator
Jessica graduated from Georgian College’s Business Accounting program in 2011. Now with a young family and a new business, she is excited to team up with her husband to make something of their own. Jess brings some pretty big skills to the table, including writing most of Johnny’s emails for him and leaving awkward voicemails for clients because answering machines make her nervous.
Other than managing all things administrative, Jess occasionally updates the this site and does her best not to loathe it. So thanks to all of you who have complimented the website! It truly does make her day knowing her frustrated efforts were not all for nothing!
MARTIN OVERGAAUW
Supervisor/Lead Climber, ISA Certified Arborist
MASON ELLIS
Groundsman
Mason joined the Northshore team in 2021, and soon came to the conclusion that this job was not like anything else he had tried, but he couldn’t see himself doing anything but this! Mason went on to graduate from the Humber Urban Arboriculture Program. Despite working long hours out in the sun, he enjoys spending his off time outdoors, going ice fishing, watching Star Wars , spending time with his girlfriend and friends, and most importantly going to Walmart.
STEVEN HENDERSON
ISA Certified Arborist
Steven is a another born-and-raised Barrie boy who, after attending the Toronto Film School for Film Production and working a while, decided to take a dramatic turn towards the outdoors to attend Humber College’s Arborist Pre-Apprenticeship program in 2020. Since then, he’s worked in Vancouver and Toronto and is excited to be back in his home town. Other than climbing trees, Steven enjoys camping, hiking, fishing, playing guitar, and photography.
EVAN DANIEL
Arborist Apprentice
Isaac Kiezebrink
Arborist Apprentice
Isaac joined the Northshore team in 2023, and is Martin’s brother-in-law. He is also completing the Arboriculture program through Humber College. In his spare time, Isaac enjoys playing hockey, bonfires, and hanging out with family and friends.
Toby Johnson
Groundsman
Toby joined us in 2025 as a recent high school graduate. Outside of work he likes to stay outdoors; skiing, rock climbing, camping, hiking, and seeing new places. He looks forward to dragging clients sticks and carrying logs to the chipper every day.
Choosing Northshore means choosing a partner who is deeply invested in your satisfaction and the well-being of your trees. We invite you to experience the Northshore difference for yourself. Deep roots grow a legacy, and we’re here to help you cultivate yours.
