About Us

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The Pacific Northwest Chapter of the International Society of Arboriculture (PNW-ISA) is a member organization for arborists and urban foresters. Read More.

Program Areas

The work of PNW-ISA is divided into five program areas. Read More.

Staff & Board

Staff | Patty Williams, Executive Director | As PNW-ISA’s Executive Director since January 2002... Read More.


PNW-ISA furthers its mission to foster a greater appreciation of trees and promote the professional practice of arboriculture by partnering with the Tree Research and Education Endowment (TREE) Fund. Read More.

Become a Member

PNW-ISA membership is open to anyone interested in the proper care of trees. Read More.

Contact Us

Our chapter office is pleased to handle your inquiries or listen to your concerns. Read More.