Ontario commercial arborists association

2019 OCAA Board of Directors

Jeremy Hamlin of Shadylane Expert Tree Care

Vice President:
Calvin McCallum of CLC Tree Services

Mike McNairn of Universal Field Supplies

John Ransom of Davey Tree Expert Co. of Canada Ltd.

Past President:
Patricia Thomson of Thomson Watson Consulting Arborist

Mark Graves of Grave Oak Tree care

Christopher Timperson of Bartlett Tree Bartlett Tree Experts

Trish Thomson 
Thomson Watson Consulting Arborist

Past President

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

Jeremy Hamlin

Shady Lane Expert Tree Care


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

Mike 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

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