Ontario commercial arborists association

2016/2017 Board of Directors

Jonathan Arnold
Shady Lane Tree Care

Past President

General info:  

  • Owner/Operator
  • ISA certified  
  • Father (Lewis Arnold) co founder of OCAA.  
  • Humber college graduate in 2002 
  • On the board since 2011 
  • Past director of membership.  
  • Acting president since 2013

Trish Thomson 
Kelly's Tree Service


General info: 
  • Graduated from the University of Toronto Forestry Program in 1987
  • Worked for the City of Toronto as an Integrated Pest Management Inspector
  • Joined Shady Lane Tree Care in 1990 as a Plant Health Care Specialist
  • In 1991 joined the faculty in the Humber College Landscape Technology Program as a contract instructor in woody plant assessment, tree identification, insect and disease identification and preparation for pesticide licensing for students
  • Spent four years as a Consulting Arborist in Thomson, Bruce and Associates and Patricia Thomson, Consulting Arborist. Both provided professional, scientific plant health consulting services in the commercial, municipal and private sectors.
  • Currently a Consulting Arborist and General Manager for Kelly’s Tree Care since 2001 and became co-owner in February 2010.
  • Certified Arborist (ON-0132A) with the International Society of Arboriculture since 1993

John Arico
Davey Tree Expert Co. of Canada Ltd.

Vice President

General Info:

  • Graduate of Sir Fleming College’s Forestry Technician Program and attended DITS in 1995.
  • John has held various positions including Assistant District Manager at the Toronto West Office, District Manager at the Toronto East Office and Area Operations Manager for Ontario Residential Services.
  • ISA certified Arborist and is currently a member of the President’s Council.
  • Currently a member of the President’s Council.

Mark McNairn
Universal Field Supply


General Info: 

  • Operations manager for Universal Field Supplies. Worked in the industry as a supplier for over 25 years.
  • Graduate of Fleming College, Forestry program

Shane Lund
Four Seasons Tree Care & Service Ltd.


General Info: 

  • Has worked for Four Seasons Tree Care for 18 years .
  • Currently an Instructor at Humber College since 2008.
  • ISA Certified Arborist 
  • ISA Certified Tree Climber 
  • Ontario Qualified Arborist 
  • Training with Arboriculture Canada
  • In house trainer for Four Seasons Tree Care.

Jeremy Hamlin

Griffith Property Services Ltd.


General Info: 

  • Educated at Sir Sandford Fleming College as a forestry technician and ecosystem management technician
  • Worked in Ottawa as a forestry technician and logger
  • Became an ISA Certified arborist in 2004
  • Started as a tree worker for Weller tree service in various roles from ground support growing into a production climber
  • Learned some finer points of arboriculture after several years with Authentic Tree care
  • Gained some valuable municipal experience as an arborist with the city of Markham and a Crew leader with the town of aurora
  • Applied experience and joined the power workers union as an electrical forester journey person
  • Rejoined the commercial arboriculture ranks as the operations manager for Uxbridge tree service

Iain Pike
Upper Canada Tree Services 


General Info: 

  • 22 years in the industry.
  • Graduated from Urban Tree Maintenance at Humber in 1997
  • Became ISA Certified in 1997
  • Started Upper Canada Tree Services and became self employed in 2000‎. 
  • Competed in the Ontario Tree Climbing Comp for approximately 15 years, represented Ontario at the ITCC in 2000, retired from competing and now volunteer at the event. 

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