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Suggested Credentials
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Douglas Fir
4 Credentials
1 Issuer
The International Society of Arboriculture
Hereby Announces That
Has Earned the Credential
ISA Certified Urban Forest Professional
By successfully meeting ISA Certified Urban Forest Professional certification requirements through demonstrated attainment of relevant competencies as supported by the ISA Credentialing Council
31 August 2024
Issue Date
Expiration Date
Certification Number
30 July 2027
Caitlyn Pollihan CEO & Executive Director
Douglas T. Fir
IL-0001ATM
ISA Certified Urban Forest Professional
ISA Certified Urban Forest Professional
August 31, 2024
International Society of Arboriculture
The International Society of Arboriculture
Hereby Announces That
Has Earned the Credential
ISA Certified Tree Climber
By successfully meeting ISA Certified Tree Climber certification requirements through demonstrated attainment of relevant competencies as supported by the ISA Credentialing Council
5 September 2020
Issue Date
Expiration Date
Certification Number
31 December 2027
Caitlyn Pollihan CEO & Executive Director
Douglas T. Fir
IL-0001ATM
ISA Certified Tree Climber
ISA Certified Tree Climber
September 5, 2020
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
10 August 2013
Issue Date
Expiration Date
Certification Number
31 December 2027
Caitlyn Pollihan CEO & Executive Director
Douglas T. Fir
#0847 ISA Certified Arborist
IL-0001A
ISA Certified Arborist ®
ISA Certified Arborist ®
August 10, 2013
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
13 February 2013
Issue Date
Expiration Date
29 September 2029
Caitlyn Pollihan CEO & Executive Director
Douglas T. Fir
ISA Tree Risk Assessment Qualification®
ISA Tree Risk Assessment Qualification®
February 13, 2013
International Society of Arboriculture
