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Suggested Credentials
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Knut Korczak
3 Credentials
1 Issuer
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
1 July 2025
Issue Date
Expiration Date
Certification Number
31 December 2028
Caitlyn Pollihan CEO & Executive Director
Knut Korczak
DK-0006AT
ISA Certified Tree Climber
ISA Certified Tree Climber
July 1, 2025
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
28 March 2025
Issue Date
Expiration Date
28 March 2030
Caitlyn Pollihan CEO & Executive Director
Knut Korczak
ISA Tree Risk Assessment Qualification®
ISA Tree Risk Assessment Qualification®
March 28, 2025
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
19 December 2024
Issue Date
Expiration Date
Certification Number
31 December 2027
Caitlyn Pollihan CEO & Executive Director
Knut Korczak
#0847 ISA Certified Arborist
DK-0006A
ISA Certified Arborist ®
ISA Certified Arborist ®
December 19, 2024
International Society of Arboriculture
