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DO
Daniel O'Brien
1 Credential
1 Issuer
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
26 March 2007
Issue Date
Expiration Date
Certification Number
30 June 2025
Caitlyn Pollihan CEO & Executive Director
Daniel O Brien
#0847 ISA Certified Arborist
IL-4867A
ISA Certified Arborist ®
ISA Certified Arborist ®
March 26, 2007
International Society of Arboriculture
