If you are looking for a Certified Arborist in your local area, you can use the I.S.A. Certified Arborist Database.  Remember, certification is not a measure of standards of practice. Certification can attest to the tree knowledge of an individual, but cannot guarantee or ensure quality performance. Also, ask for references to find out where the company has done work similar to the work you are requesting and don't hesitate to check references. At Alberta Arborists we believe that tree care is a substantial, long-lasting investment, therefore we provide references upon request.