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David E. Allen
4 Credentials
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
30 June 2025
Issue Date
Expiration Date
Certification Number
30 June 2028
Caitlyn Pollihan CEO & Executive Director
David E. Allen
#0847 ISA Certified Arborist
OH-0171AM
ISA Certified Arborist ®
ISA Certified Arborist ®
June 30, 2025
International Society of Arboriculture
The International Society of Arboriculture
Hereby Announces That
Has Earned the Credential
ISA Board Certified Master Arborist®
By successfully meeting ISA Board Certified Master Arborist certification requirements through demonstrated attainment of relevant competencies as supported by the ISA Credentialing Council
10 May 2016
Issue Date
Expiration Date
Certification Number
30 June 2025
Caitlyn Pollihan CEO & Executive Director
David E. Allen
OH-0171BM
ISA Board Certified Master Arborist®
ISA Board Certified Master Arborist®
May 10, 2016
International Society of Arboriculture
warning
Expired
Expired credential.
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
21 March 2014
Issue Date
Expiration Date
21 March 2029
Caitlyn Pollihan CEO & Executive Director
David E. Allen
ISA Tree Risk Assessment Qualification®
ISA Tree Risk Assessment Qualification®
March 21, 2014
International Society of Arboriculture
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
10 January 2012
Issue Date
Expiration Date
Certification Number
30 June 2027
Caitlyn Pollihan CEO & Executive Director
David E. Allen
OH-0171BM
ISA Certified Urban Forest Professional
ISA Certified Urban Forest Professional
January 10, 2012
International Society of Arboriculture
