Contact Us

Offices for both the Washington State Chapter (previously the "Cascade" Chapter) and the Northwest Regional staff are at:

  • 180 Nickerson St, Suite 202, Seattle, WA 98109
  • Phone: 206-378-0114
  • Fax: 206-378-0034

Washington State Chapter


  • Morgan Ahouse, Development Associate, 206-378-0114, Ext. 300

To learn how to make changes to your membership information, click here.

To contact committee leaders, please see visit these pages: Support Committees, Issue Committees, Outings Committee.

To contact local groups, please visit our Groups pages.

The Crest newsletter published and mailed quarterly and is available online. It also contains a printer-friendly summary of Washington State Chapter contact information.

Seattle Inspiring Connections Outdoors (ICO)
(Formerly Inner City Outings)
117 E. Louisa St., No 315 
Seattle, WA 98102

Northwest Regional staff

Phone: 206-378-0114

Ext.   Name, Position

309   Ben Avery, Associate Director, Chapter Fundraising                         

315   Marc Heileson, Senior Organizing Manager

305   Kathleen Ridihalgh, Senior Organizing Manager

304   Doug Howell, Senior Campaign Representative

Beyond Coal Campaign:

307   Bill Arthur, Deputy Regional Campaign Manager

319   Seth Ballhorn, Associate Organizing Representative

308   Robin Everett, Field Organizer

321   Meg Matthews, Communications Associate

Our Wild America Campaign:

311   Dan Ritzman, Regional Director


Sierra Club (national)

Member Services
San Francisco, California