Executive Committee

Our Executive Committee consists of seven elected chapter leaders and four group representatives.  As needed, there may be up to two appointed volunteers to serve as secretary and treasurer.  Additionally, each Group has its own Executive Committee.



2019 Chapter Executive Committee

Chair: Colin Yost
Vice Chair: Lucienne de Naie
Treasurer: Nara Takakawa (non-voting member)
Moku Loa Group: Debbie Ward
Maui Group: Clare Apana
Oʻahu Group: Doug Fetterly
Kauaʻi Group: Jade Moss
At-large: Kau‘i Pratt-Aquino
At-large: Sheila Sarhangi
At-large: Heather Kimball
At-large: Lori Mallini
At-large: Mike Nieling
At-large: Nate Yuen, conservation chair
High School Hikers: Jamie Tanino (non-voting member)

Meet our ExCom Members: 

Colin Yost, Chair

Colin Yost is an environmental advocate whose career includes roles as a Green Corps Organizer in Philadelphia, an attorney representing Sierra Club of Hawaiʻi on the pivotal Koa Ridge case where development threatened productive agricultural land, as well as other land use, public access and marine protection matters affecting our island state. Notably, he was also the Civil Fraud prosecutor against Enron and recovered $32 million dollars for Oregon consumers. Currently, he’s a part-owner and Chief Operating Officer of local solar energy and smart home company, RevoluSun.


Lucienne de Naie, Vice Chair

Lucienne de Naie is a long time Club member who has served as Chair and Vice-chair of the Sierra Club Hawai‘i Chapter Executive Committee. She is a researcher and writer whose passion is protection of native plants, streams, watersheds, and cultural sites.



Nara Takakawa, Treasurer


Debbie Ward, Moku Loa Group
Debbie has been a member of the Executive Committee and Conservation Committee during most of the past thirty years. Retired from University of Hawaiʻi, she is now growing organic fruit for market. She is working to reduce industrial expansion in the conservation district atop Mauna Kea. She believes Sierra Club can play a critical role in protecting vulnerable native habitats, securing public access to shorelines for Hawaiʻi’s people, and in securing a path to energy self-sufficiency.
Doug Fetterly, Oʻahu Group

Doug is very passionate about the ocean and has worked on countless local and national campaigns advocating for our marine resources. He is the chair for the Sierra Club National Marine team and Sierra Club International team. Doug was the former Systems Manager for USA today Northern California, vice-chair for the Natural Resources Commission in Davis, CA.


Clare Apana, Maui Group

Clare, a native of Wailuku, Maui is a cultural practitioner and teacher who is deeply involved with cultural preservation issues throughout Maui. Clare received the Sierra Club’s Onipa‘a Award in 2013 for her dedication to protect Maui’s traditional cultural landscapes and burial areas. She has a Master’s Degree in Physical Therapy and has a private practice in both Maui and Honolulu.


Jade Moss, Kauaʻi Group

Jade Moss is a 10-year resident of Hawaiʻi with eight years on Kaua‘i. She enjoys volunteering with the Sierra Club to preserve open spaces, marine environment, and cultural sites. Jade hopes that, one day, Hawai‘i residents can utilize sustainability practices that Hawaiians had mastered. She has a Bachelor’s degree in journalism from San Diego State University.


Kauʻi Pratt-Aquino, At-large

Kau‘i Pratt-Aquino is a native rights and environmental advocate who has dedicated her life to improving the status of kanaka and the greater community through education, cultural stewardship and pono leadership. She believes the Sierra Club can play a critical role in strengthening the alliance between native and environmental advocates to effect positive change. As a mom and lawyer, she is committed to creating a better future for our keiki.


Sheila Sarhangi, At-large

Sheila Sarhangi is a communications strategist who specializes in partnering with communities, nonprofits, foundations, and government agencies to achieve conservation goals. She has worked on a wide range of environmental issues across the Pacific, in Hawai‘i, Palau, Fiji, Papua New Guinea, the Northern Mariana Islands and Indonesia, on issues ranging from endangered species protection to community-based fishing rules and public access. She was also the local campaign director for the expansions of Papahānaumokuākea and the Pacific Remote Islands Marine National Monuments.

Heather Kimball, At-large

Heather Kimball is a scientist with a background in systems ecology and climate change mitigation and adaptation. With the Sierra Club, she advocates for policies to reduce greenhouse gas emissions, protect the wild spaces of Hawai‘i, build connections and resilience in our communities and promotes environmental, social and economic justice.


Lori Mallini
Lori Mallini is an environmental policy advocate with a passion for protecting the places she lives and loves. She is a recent graduate from Hawai‘i Pacific University, with a Bachelor’s in Environmental Studies with a focus on environmental policy. Lori has volunteered with Sierra Club as a hike guide, during Get Out the Vote efforts, and most recently as a policy advocate during the 2019 legislative session, where she championed bills relating to recycling and waste.


Nate Yuen, At-large

Nate Yuen works as an accountant for an engineering consulting firm but on the weekends becomes an amateur naturalist, hiker, and photographer focused on the flora and fauna of Hawaiʻi. His blog, hawaiianforest.com, documents some of the rarest species on the planet. Through his involvement in conservation he has become an advocate for creating critical habitat for native species, protecting water resources, and a host of other environmental, political, and economic issues crucial to creating a sustainable future for our islands.

Jamie Tanino – coming soon