Credential Verification for certified tree workers can be found:
NJ Board of Tree Experts - Committee for the Advancement of Arboriculture
International Society of Arboriculture - Verify a Certification
Sources for credentialing can be found in these flyers:
Better Business Bureau - How to Choose a Tree Care Company
New Jersey Department of Health and Senior Services
Please let me know if there are any industry certifying bodies I have overlooked.
Agree? Disagree? Discuss online or write a letter.