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.


2018 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: (TBD)
Oʻahu Group: Hunter Heaivilin
Kauaʻi Group: Judy Dalton and Rayne Regush
At-large: Randy Ching, outings chair
At-large: Sheila Sarhangi, newsletter committee
At-large: Kylie Wager, compliance officer
At-large: Nate Yuen, conservation chair
Legal Chair: Alan Burdick (non-voting member)
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.



Kim Toomey, Maui Group

Kim Toomey is an active community volunteer and avid hiker who owned and managed a successful multi-million dollar business before moving to Maui six years ago. She also has experience as a director of project management. Kim looks forward to using her professional skills to serve the Hawaii chapter and help protect these unique and beautiful islands.



Hunter Heaivilin, Oʻahu Group
Hunter Heaivilin grew up in Hawaiʻi and is currently pursuing his PhD in Geography, researching Hawaiʻi’s agricultural land use and climate change. He works as an agricultural planner and also serves as Chair of the Oʻahu Group Executive Committee while spearheading the group’s efforts to preserve agricultural land and support local food.




Judy Dalton, Kauaʻi Group
Judy has served on the Kaua‘i Group Executive Committee for 22 years and the Chapter ExComm for 17 years. She facilitated formation of Mālama Māhā‘ulepu in 1999; initiated the cease of construction of a 3/5-mile-long beach-destroying seawall fronting the Wailua Golf Course in 1996; and legally challenged the Planning Commission to increase coastal setbacks for a development along the coast between Kealia Beach and Donkey Beach. She worked for years trying to prevent the county from building the beach-destroying concrete bike path on top of Wailua Beach.



Rayne Regush, Kauaʻi Group

Serving on the Kauaʻi Group ExCom since 2004 and as Kauaʻi Group rep for the Hawaiʻi Chapter from 2008-2013, Rayne works diligently to preserve the island’s unique environmental resources and rural character. She is a dedicated advocate for historic trail access and currently serves on the state Na Ala Hele Kauaʻi Advisory Council. She is active in community issues related to land use and sustainability, and is passionate about preserving the island’s cultural heritage and monitoring shoreline applications to protect coastlines from encroaching development.


Randy Ching, At-large

Randy has been a volunteer for 25 years and has held almost every position in the Club. His work with the Club has focused on climate change adaptation, water protection, and engaging more members in service projects and outings. Currently, he is working on increasing DLNR funding for the maintenance of trails, beaches, and state parks—and strongly believes more funding should go to DLNR than to the Hawaiʻi Tourism Authority. Together with Dave Raney he is also working with lawmakers on sea level rise adaptation policies.


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.


Kylie Wager Cruz, At-large

As an associate attorney at Earthjustice, Kylie has represented grassroots community groups, including the Sierra Club and has been advocating for clean energy, restoring stream flows, cleaner ocean waters, and better pesticide regulation. Kylie has interned for the Hawai‘i Public Utilities Commission, Blue Planet Foundation, and worked as a research associate for the Center for Island Climate Adaptation and Policy. She has served as a law clerk for the Honorable Mark E. Recktenwald and an extern for the Honorable Richard R. Clifton. Kylie is a proud graduate of the UH’s William S. Richardson School of Law, with a certificate in environmental law. Her experience reporting on environmental and cultural issues on Maui inspired her to become a public interest environmental lawyer in Hawai‘i.


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.

Alan Burdick – coming soon

Jamie Tanino – coming soon