25.9.2
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Suggested Credentials
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WJ
William Johnston
3 Credentials
1 Issuer
The International Society of Arboriculture
Hereby Announces That
Has Earned the Credential
ISA Board Certified Master Arborist®
By successfully meeting ISA Board Certified Master Arborist certification requirements through demonstrated attainment of relevant competencies as supported by the ISA Credentialing Council
13 March 2024
Issue Date
Expiration Date
Certification Number
30 June 2027
Caitlyn Pollihan CEO & Executive Director
William Johnston
RM-8069B
ISA Board Certified Master Arborist®
ISA Board Certified Master Arborist®
March 13, 2024
International Society of Arboriculture
The International Society of Arboriculture
Hereby Announces That
Has Earned the Credential
ISA Tree Risk Assessment Qualification®
By successfully meeting ISA Tree Risk Assessment Qualification requirements through demonstrated attainment of relevant competencies as supported by the ISA Credentialing Council
22 October 2022
Issue Date
Expiration Date
22 October 2027
Caitlyn Pollihan CEO & Executive Director
William Johnston
ISA Tree Risk Assessment Qualification®
ISA Tree Risk Assessment Qualification®
October 22, 2022
International Society of Arboriculture
The International Society of Arboriculture
Hereby Announces That
Has Earned the Credential
ISA Certified Arborist ®
By successfully meeting ISA Certified Arborist certification requirements through demonstrated attainment of relevant competencies as supported by the ISA Credentialing Council
2 January 2018
Issue Date
Expiration Date
Certification Number
30 June 2024
Caitlyn Pollihan CEO & Executive Director
William Johnston
#0847 ISA Certified Arborist
RM-8069A
ISA Certified Arborist ®
ISA Certified Arborist ®
January 2, 2018
International Society of Arboriculture
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Expired
Expired credential.
