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
Secretary: Doorae Shin
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: 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.




Doorae Shin, Secretary
With a B.A. in Sustainability Studies from the University of Hawaiʻi at Mānoa, Doorae became a community organizer for social justice issues at the age of 15. She carries a deep passion for nature and environmental justice. As a student, she led a campaign that banned Styrofoam from the UH Mānoa campus and also served as the University of Hawaiʻi’s first Student Sustainability Coordinator. Doorae is now the Plastic Free Hawaiʻi Program Manager for the Kōkua Hawaiʻi Foundation. She also serves on the Board of Directors of Kōkua Market and spends her free time advocating for a sustainable food system and enjoying time in nature.


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, coming soon!


Clare Apana, coming soon!


Jade Moss, coming soon!


Kauʻi Pratt-Aquino, coming soon!


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.



Nate Yuen, At-large

Nate Yuen works as an accountant for an engineering consulting firm during the week but on the weekends he 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. In 2013, he was appointed to be a commissioner on the Natural Area Reserves System Commission which oversees the most biologically and geologically sensitive lands owned by the State of Hawaiʻi. Through his involvement in conservation he has become an advocate and activist for creating critical habitat for native species, keeping our sources of fresh water clean, ensuring stream water rights for kalo farming, and a host of other environmental, climate change, food sustainability and political/economic issues crucial to creating a sustainable future for our islands.

Jamie Tanino – coming soon