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EXPIRED ON JUNE 30, 2024 The requirements to renew this ISA credential have not been met and your credential has expired. You are required to immediately stop using the associated ISA credential logo and trademark on signage, equipment, advertisements, or in any other manner. Should ISA receive notification that you are continuing to use the logo and/or trademark, you will be subject to ISA’s Trademark Violation and Logo Misuse process, which may result in legal action. We value your service in the industry and your previous efforts to acquire and demonstrate the arboricultural knowledge necessary to receive an ISA credential. We hope you will consider re-earning this credential. If we can assist or answer any questions, please contact the ISA Customer Service Center at +1.678.367.0981 or email isa@isa-arbor.com International Society of Arboriculture
International Society of Arboriculture

ISA Certified Arborist ®

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Andreas Weichselbaum

ISA Certification is a voluntary program that tests and certifies a professional’s achievement of a standard level of knowledge and skill in the field of arboriculture. When a professional becomes an ISA Certified Arborist, they should be recognized by their peers and the public as a tree care professional who has attained a generally-accepted level of knowledge in areas such as tree biology, diagnosis, maintenance practices, safety, and other subject and practice areas within the tree care profession as identified through periodic job task analyses.

Skills / Knowledge

  • tree maintenance
  • tree pruning
  • pruning
  • tree care
  • tree diagnosis
  • tree planting
  • arboriculture
  • tree management
  • tree inspection

Issued on

March 28, 2003

Expired on

June 30, 2024

Earning Criteria

Required

experience

A minimum of three years of full-time experience in arboriculture or a combination of education and practical arboricultural experience.

exam

Pass a comprehensive, standardized examination designed to assess the knowledge and skills in areas such as tree biology, diagnosis, maintenance practices, safety, and other subject and practice areas within the tree care profession as identified through periodic job task analyses. The examination is made up of 200 multiple-choice questions.

participation

Recertify every three (3) years through at least 30 points of Continuing Education Units (CEUs).

other

Adhere to a professional Code of Ethics.

Job Insights

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