Staff & Board


Patty Williams

Executive Director

As PNW-ISA’s Executive Director since January 2002, Patty uses the Board of Directors' strategic vision to direct staff members, committees, and other volunteers. She holds a Master of Science degree in Agribusiness Economics from Southern Illinois University Carbondale. She resides in Carlton, Oregon.

Contact Information

  • Phone: 503-312-0245
  • Email:

Melissa Amrhein

Education Program Manager

Melissa Amrhein

Melissa has an undergraduate degree in Community, Environment, and Planning and graduate degrees in Forest Resources and Public Administration from the University of Washington. When she is not working on the Continuing Education Program, Melissa enjoys spending time with her husband and daughter, doing yoga, and exploring the great outdoors of the Pacific Northwest.

Contact Information

  • Phone: 206-617-8052
  • Email:

Margo Thorp

Education Program Coordinator

Margo graduated from Western Washington University with a Bachelor of Arts in Education, focusing on science education in the K-8 classroom. She has worked as a Coordinator for the UW – Friday Harbor Labs Science Outreach Program and as a Program Coordinator with the University of Washington managing operations for degrees, certificates, and courses focused on the environment, engineering, and technology.

For the past four years, Margo has participated in Horticulture courses at Edmonds Community College with a general focus on arboriculture, pruning, and tree care. She is currently spending a year working as an intern with the Elisabeth C. Miller Botanical Garden in the Seattle area. Outside of work Margo enjoys skate skiing, hiking, boating, gardening, and baking.

Contact Information

  • Email:

Dana Hatley

Administrative Assistant

Dana Hatley

Dana has served as PNW-ISA's Administrative Assistant since December 1999. She lives in Silverton, Oregon with her husband Roger. She enjoys gardening, bike riding, and family time with her three adult children.

Contact Information

  • Phone: 503-874-8263
  • Email:

Board of Directors

Lance Davisson


The Keystone Concept, LLC, in Boise, ID

Lance owns a consulting company, The Keystone Concept, LLC, located in Boise, Idaho. He has been a natural resource professional for over 14 years working in the fields of: agriculture, forestry, commercial leasing and urban forestry. Lance is an ISA Certified Arborist and has been a member of ISA since 2008.

Lance served as PNW-ISA Governance Director from January 2013 – September 2014, where he worked with the Board of Directors, Staff and Membership at PNW-ISA to enhance strategic delivery of our programs. Lance became PNW-ISA Board President in September 2016 and looks forward to working alongside the board to enhance our education programming and strategic program delivery, maintaining the highest standard of excellence and service for our membership.

When not at work, Lance enjoys spending time with his wife and daughter enjoying the outdoors of the Pacific Northwest, including whitewater rafting, camping, and hiking. Lance also enjoys training and competing in cycling and triathlon events throughout the PNW.

Contact Information

  • Phone: 208-994-1135 (cell)
  • Email:

Philip Bennett

President Elect

City of Snoqualmie, in Snoqualmie, WA

I am the President Elect for the Pacific Northwest ISA. I work as an urban forester for the City of Snoqualmie and as city arborist for the City of Clyde Hill. My daily work includes all physical aspects of caring for trees, including planting, pruning and removal. I also work on program development, grant writing, plan review, developing partnerships and educational programs.

Before becoming an arborist, I worked as an environmental educator and wilderness guide. I continue to be passionate about learning and teaching. I came into the field of arboriculture vocationally, and have learned along the way. I believe it's important to keep learning, as ideas and research are constantly evolving.

Contact Information

  • Phone: 206-491-0031
  • Email:

Chris Rippey


Seattle Parks Department, in Seattle, Washington

Chris Rippey is a third-generation arborist who works for the Seattle Parks Department in Seattle, Washington. He is a ISA certified Arborist, Municipal and Utility Specialist, and a Certified Tree Worker specializing in climbing. He has been Tree Risk Assessor Qualified since 2013 and is a Registered Consulting Arborist #633 through the American Society of Consulting Arborists.

Chris started his career in arboriculture at the age of 16 with his father’s company. His career has included working in both the commercial and municipal fields as well as owning and operating his own tree businesses. Chris spent 14 years working as an Arborist for Stanford University in Palo Alto, California.

As Secretary, Chris is looking forward to bringing his insights as a current tree worker to the Board of the PNWISA. His goal is to represent the opinions and experience of a person who has spent 20 years as an active tree worker.

When not working on tree stuff or doing house chores, Chris enjoys competing in cycling events and taking his family to Seattle Thunderbirds hockey games.

Contact Information

  • Email:

Kris Josey


ArborCare Resources, Inc., in Hailey, ID

Kris Josey graduated from University of Colorado, Boulder with a BS in Accounting in May 1989. Upon graduation she worked as a staff accountant with Coopers & Lybrand’s Denver, Colorado office from June 1989 to November 1992. She obtained her CPA license in 1992. Later that year, she moved to Idaho and worked in a local accounting office until June 1996 when she left public practice to be a stay at home mom with her 2 young sons. In early 1997, she and her husband, Bill, combined her business/accounting knowledge with his tree care knowledge to start their family business ArborCare Resources, Inc.  Kris continues to be actively involved with the management of the business.

In 2003 Kris was appointed to the ISA’s finance committee and in 2014 she joined ISA’s conference and events committee. Her goal as the Treasurer for the PNW Chapter is to provide a business perspective to the Board as it explores new initiatives and continues to grow membership services for all members.

In her free time she is a regular at the local CrossFit gym or outside enjoying the Sun Valley area skiing/snowboarding, hiking, or mountain biking.

Contact Information

  • Phone: 208-788-1611 ext. 102
  • Email:

Anna Heckman

Member Services

I was fortunate enough to go to school and focus my studies in forest ecology. After working as a seasonal for the Forest Service and a field research scientist for the University of Washington, I went back to school for a master’s degree in urban horticulture. For nearly 10 years now I have worked government positions as a vegetation manager and restoration ecologist. In every department I worked I was the only certified arborist on staff and my skill set was well used. Now I work for the City of Everett Parks and Rec department as their Urban Forester.

I live in Edmonds, WA. I am involved in the habitat restoration community as a board member and volunteer for a nonprofit organization – Sound Salmon Solutions. I enjoy bike touring and trekking through alpine environments, knitting, baking, and making soap. My spouse of nearly 20 years and my early teenage boy keep me busy and have introduced me to new loves as they follow their hearts and passions as well. Baseball, saltwater fishing, and jazz clubs/concerts are some of the new life adventures I may never have known or appreciated if it were not for family.


Ashley Adams


City of Kirkland, Washington

I currently work as the City Arborist with the City of Lake Forest Park, Washington, where I collaborate with citizens, developers, arborists, and City staff to apply Lake Forest Park's tree codes. I'm a fourth-generation Washingtonian and a proud Husky having graduated twice from the University of Washington with a Bachelor of Science in Forest Resources and a Master of Science in Environmental and Forest Sciences. I'm an ISA Certified Arborist, Tree Risk Assessment Qualified, and am always seeking out new opportunities to expand upon my knowledge in arboriculture.

As the Certification Director, my job is to serve as the conduit for certification tests and to assign Continual Education Units (CEUs) to arboricultural and safety classes, training seminars and courses.

I look forward to serving the PNW-ISA’s Chapter members and expanding upon the educational opportunities for our community of arboricultural professionals.

In my free time I enjoy traveling, downhill skiing, climbing big mountains, cruising around town on my vintage motorcycle, and seeking out new adventures with my 12 year-old son, Felix.

Contact Information

  • Email:

Micki McNaughton

Continuing Education Director

Arborea, LLC, in Olympia, WA

I own and operate Arborea, LLC, as an urban forestry planning and programming consultant. I am also currently employed as an Urban Forestry Special Project Coordinator for the Washington State Dept. of Natural Resources Urban and Community Forest Program. I am an ISA Certified Arborist and Municipal Specialist, and a graduate of the Municipal Foresters Institute as well as the Pacific Northwest Community Tree Management Institute.

I am passionate about the role of trees in our lives and our world, and a strong proponent of continuing education for arborists and urban foresters. I am excited to have this opportunity to help build the Chapter’s education program, to provide tools and skills to help us as arborists evolve with the changing landscape around us.

I enjoy traveling with my partner by boat and by motorcycle. Other favorite activities include sailing, gardening and cooking, and a current obsession is knitting!

Contact Information

  • Phone: 360.790.6294
  • Email:

Nadia Chan

Public Outreach

Hi, my name is Nadia Chan and I was elected to the Board in September 2013 as the Director of Public Outreach. I have been a Certified Arborist since 2005 and a Certified Tree Risk Assessor since 2007. I have a Bachelor of Science in Forestry and currently work for the City of Surrey as the City’s Natural Areas Coordinator. My current job involves managing over 1500 ha (3700 acres) of natural areas in an urban environment. From the management of forest health, trail systems, invasive species and wildlife, my day-to-day work can be extremely varied. This can bring a lot of challenge, but also a lot of rewards!

I live in Vancouver, B.C with my husband and two children. In my spare time I enjoy gardening, playing soccer and hockey and spending time with family and friends.

Contact Information

  • Phone: 604-501-5167 (office)
  • Email:

Charles Ray

Governance Director

Urban Forester with the City of Vancouver, in Vancouver, WA

Charles Ray is the Urban Forester with the City of Vancouver, Washington. Charles is a graduate from the Ohio State University with a Bachelor of Science in Natural Resources. He is certified through the International Society of Arboriculture as an Arborist and Municipal Specialist. He has worked in both the municipal and commercial arboriculture fields before starting with the City of Vancouver in 2001.

As Governance Director since January 2015, Charles is dedicated to working with the Board of Directors, Staff and Membership at PNW-ISA to enhance strategic delivery of our programs. His goal is to create and maintain a framework of Chapter Governance that is transparent and strategic resulting in the highest standard of excellence and service for our membership.

When not at work Charles spends time with his family, relaxing, laughing, and enjoys good music and coffee.

Contact Information

  • Phone: 360-487-8328
  • Email:

Dylan Saito


City of Portland Urban Forestry Division, in Portland, OR

Dylan Saito: a man with a dark mustache dressed in tree climbing gear.

Born and raised in Hawai’i, Dylan became very close with his natural environment.  His love for the surrounding landscape and the people that cared about it inspired him to eventually become the arborist he is has become. He is knowledgeable in all aspects of commercial arboriculture: as a grounds-person and as a climber, in rigging, consulting and sales, and for 10 years, as a crew leader.

For the last three years, he has been active in the municipal realm and has been working as a tree inspector with the City of Portland Urban Forestry Division. He assists with the development of the local tree ordinance, regulates permitting for all tree activities, and is a first responder to all "tree-mergencies" citywide.  He has also been a volunteer with the Pacific Northwest Chapter as a head judge for the regional climbing competitions for over 11 years.  His current credentials include Certified Arborist, TRAQ, FEMA Incident Command, Oregon Pesticide Handler, and EHAP.  

“I am grateful to have learned everything I know surrounding arboriculture in the Pacific Northwest, and I am very excited to be able to pass along what I’ve learned to the wider population. The Tree Community in our region has great impact on the entire Society of Arboriculture. Other areas of the globe look to the PNW for insight on how to better care for the world’s tree canopy. We have the opportunity to make changes to bring people and trees into the present.”

Matt Stine

ISA Council of Representatives

Native Ecosystems Northwest, LLC, in Portland, OR

Matt is a Forester and owner of Native Ecosystems Northwest, LLC based in Portland, Oregon. He has been practicing traditional forestry, urban forestry and native ecosystem restoration for 22 years. He has been an ISA Certified Arborist for 15 years.

One of Matt’s goals as a PNW ISA representative is to bring his experience with and knowledge of native ecosystems in the urban forest setting while raising awareness of the critical roles native ecosystems serve in healthy functional urban forests. He wants to broaden the ISA’s scope of urban forestry into the actual urban “forests”. Matt is a former member of the Oregon Community Trees board.

For recreation Matt likes to whitewater kayak, sea kayak and work in the wood shop. His favorite activity though is to spend time with his family, which includes his wife Tory, twin 16 year-old boys Taylor & Christian and his eight year-old daughter Isabel.

Contact Information

  • Phone: 971-404-4745
  • Email:

Evan Sussman

TREE Fund Liason

Sonshine Tree Care, in Stanwood, WA

Evan Sussman is the owner of Sonshine Tree Care in Stanwood, WA. Evan’s career in arboriculture began in the tropical climate of Hawai'i. In 2012 Evan moved to the Pacific Northwest.

Evan is an ISA Certified Arborist (WE-9274A), and ISA Qualified Tree Risk Assessor. He is actively involved in the furthering of the arboriculture profession in our chapter through community engagement, as a professional tree worker instructor, and in the development of apprenticeship programs.

Contact Information

  • Phone: 360.474.7787
  • Email: