REEF Board of Directors
We're volunteers with backgrounds in refrigerants, energy management, and corporate sustainability. We're organizing REEF because we believe corporate buyers can drive much-needed action on refrigerants.
Tristam Coffin, Chairman
is a Co-Founder and President at êffecterra, inc. a Public Benefit Corporation that provides sustainability technical support to companies, investors, government entities and their partners. Prior to êffecterra, he spent the majority of his career implementing sustainability and environmental initiatives as Director of Sustainability & Facilities for Whole Foods Market. He is a LEED AP and sustainability leader with expertise in multiple areas including high performance buildings, advanced refrigeration/HVAC systems, renewable energy, and waste diversion. He also co-founded the North American Sustainable Refrigeration Council (NASRC).
Zoe Dawson, President
is a seasoned sustainability leader with over two decades of experience advancing energy efficiency, decarbonization, and refrigerant management initiatives. Zoe serves as the Technical Sustainability Program Leader at êffecterra, inc. a public benefit corporation where she supports industrial, institutional, and commercial clients achieve their sustainability goals through strategic refrigerant asset management planning and implementation. Prior to êffecterra, Zoe spent over a decade at VEIC, where she played a key role in leading statewide energy efficiency programs and utility-led R&D pilots focused on optimizing energy use, reducing energy burdens for low-income customers, and advancing emerging technologies. As a skilled business leader and strategic planner, Zoe is passionate about fostering cross-sector collaboration and building impactful partnerships to accelerate climate solutions.
Kristen Taddonio
is a dedicated climate and energy efficiency professional specializing in reducing refrigerant emissions and helping people save money while protecting the planet. Her decades of experience span public and private sectors, including leading commercial building energy efficiency partnerships at the U.S. Department of Energy, heading sales and marketing for Energy Star appliance programs, reducing refrigerant emissions at the U.S. Environmental Protection Agency, serving as senior climate and energy advisor at the non-profit Institute for Governance & Sustainable Development, and consulting on Montreal Protocol Kigali Amendment HFC phasedown implementation in developing countries for the World Bank. She lives in Fraser, Colorado, in a net-zero energy house that won the 2020 Department of Energy Solar Decathlon build challenge competition.
Mike Armstrong
is the President and Managing Director of A-Gas in the Americas. In this role, Mike is responsible for strategy development, business execution, and technology deployment in the rapidly growing Americas marketplace. Mike joined the Americas team in 2016, as its first Chief Operating Officer, and assumed leadership responsibilities as the President of A-Gas in the Americas in 2017. Prior to that, Mike served for over 15 years in a variety of Engineering, Commercial, and Operational leadership roles with Linde, a global leader in the industrial gas market. Mike holds a Master of Business Administration from the Kellogg School of Management at Northwestern University, a Bachelor of Science from the United States Military Academy at West Point and served 6 years as an active-duty Army Officer in Europe and the United States.
Heather Clark
led the all-of-government mobilization to transition the U.S. building sector to zero emissions as Senior Director for Building Sector Climate Policy at the White House—advancing federal investments and partnerships to create clean manufacturing jobs and transform our built environment. Heather has also been at the forefront of some of the most innovative decarbonization projects in the U.S., from her leadership at RMI on the Inflation Reduction Act and her work at Biome Studio where she pioneered ambitious decarbonization and clean energy projects to benefit underserved communities. Her deep technical expertise—paired with her leadership in policy, real estate development, and clean energy—makes her a tremendous asset to REEF as we work to eliminate refrigerant emissions and scale sustainable HVAC tech.
Ramé Hemstreet
is a senior adviser to Kaiser Permanente’s SVP of Facilities, overseeing infrastructure projects, reducing total cost of ownership, and advancing sustainability initiatives. As Chief Energy Officer, he leads the organization’s energy and water strategy, driving efficiency, resiliency, and carbon reduction—culminating in Kaiser Permanente’s carbon-neutral certification in 2020. Previously, Ramé served 29 years in the U.S. Navy, concluding as Commanding Officer of Naval Facilities Engineering Command Washington, D.C. He holds advanced degrees from UC Berkeley, the National War College, and Tulane University, along with executive training from Harvard and UVA Darden Business School. A licensed engineer and certified energy manager, he sits on UC Global Climate Leadership Council and was Healthcare Design Magazine Owner of the Year in 2021.
Pooya Soltanian
is a Professional Engineer and Certified Project Manager with over seven years of experience leading large-scale construction, retrofit, and decarbonization initiatives across industrial, retail, and data center sectors. At IKEA North America, he manages portfolio-wide sustainability projects—from HVAC electrification and energy storage to solar PV and EV infrastructure—while advancing IKEA’s carbon neutrality roadmap. With expertise in LEED, Net Zero Carbon design, and regulatory compliance, Pooya brings a systems-level approach to infrastructure decarbonization. His collaborative leadership supports REEF’s mission to eliminate refrigerant emissions and scale fossil-free technologies across North America’s built environment.
Stet Sanborn
is an award-winning designer and nationally recognized thought leader at the intersection of architecture, engineering, and climate action. He serves as the Director of Climate IMPACT at SmithGroup, where he leads a national, transdisciplinary team focused on Performance, Analytics, Sustainability, Climate Resilience, and Decarbonization. With a dual background in mechanical engineering and architecture, Stet brings a unique, systems-level perspective to the challenge of eliminating building emissions. Stet is a passionate advocate for Net Zero Energy and Net Zero Carbon buildings, and a leading voice in statewide electrification and decarbonization efforts. Through his work, Stet continues to advance bold, pragmatic strategies to eliminate refrigerant and building emissions, helping the shift toward a restorative, fossil-free national future.
Ethan Arbiser
is a Senior Energy & Sustainability Manager at CBRE, where he now leads broader portfolio-wide initiatives focused on carbon reduction strategy, energy efficiency, and sustainability project execution across commercial real estate. Before joining CBRE, Ethan held analytical roles at focused on leveraging Scope 1, 2, and 3 emissions data, as well as water and waste metrics, to support corporate sustainability and ESG strategies across various industries. An Atlanta native, Ethan is passionate about driving measurable environmental impact in the built environment. Outside of work, he enjoys spending time with his wife, family, and friends, exploring Atlanta’s neighborhoods/food scene, cooking, working out, and training Brazilian Jiu Jitsu.
Behzad Torabifar
is PE, Executive Director and Head of Site Services Sustainability at Genentech, where he is leading the implementation of the company’s sustainability goals in alignment with Roche’s 2029 and 2045 environmental commitments. Behzad is a licensed Professional Engineer (P.E.), Project Management Professional (PMP), and Certified Energy Manager (CEM). He holds advanced degrees in Civil and Environmental Engineering and a Master’s in Sustainability Management from Columbia University in New York. With over 20 years of experience in engineering and sustainability, Behzad is known for translating vision into measurable results through innovation and collaboration.
