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William Weiti Lien
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
15 January 2022
Issue Date
Expiration Date
Certification Number
30 June 2025
Caitlyn Pollihan CEO & Executive Director
William Weiti Lien
#0847 ISA Certified Arborist
WE-13893A
ISA Certified Arborist ®
ISA Certified Arborist ®
January 15, 2022
International Society of Arboriculture
