25.13.16
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TD
Tom Derr
3 Credentials
1 Issuer
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
8 April 2021
Issue Date
Expiration Date
8 April 2031
Caitlyn Pollihan CEO & Executive Director
Thomas Gregory Derr
ISA Tree Risk Assessment Qualification®
ISA Tree Risk Assessment Qualification®
April 8, 2021
International Society of Arboriculture
The International Society of Arboriculture
Hereby Announces That
Has Earned the Credential
ISA Certified Arborist Utility Specialist®
By successfully meeting ISA Certified Arborist Utility Specialist certification requirements through demonstrated attainment of relevant competencies as supported by the ISA Credentialing Council
4 March 2006
Issue Date
Expiration Date
Certification Number
31 December 2025
Caitlyn Pollihan CEO & Executive Director
Tom Derr
WE-3203AU
ISA Certified Arborist Utility Specialist®
ISA Certified Arborist Utility Specialist®
March 4, 2006
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
17 July 2004
Issue Date
Expiration Date
Certification Number
31 December 2025
Caitlyn Pollihan CEO & Executive Director
Tom Derr
#0847 ISA Certified Arborist
WE-3203AU
ISA Certified Arborist ®
ISA Certified Arborist ®
July 17, 2004
International Society of Arboriculture
