Our policy experts


  • Areas of expertise: Natural gas law and policy, water

    Office: Austin, Texas

  • Schwartzman, Steve Senior Director, Tropical Forest Policy

    Areas of expertise: Climate change, tropical forest policy, Reducing Emissions from Deforestation and forest Degradation (REDD), Brazil and the Amazon, indigenous peoples, incentives for environmental protection

    Office: Washington, D.C.

  • Siciliano, Graziella Senior Manager of Carbon and Energy

    Areas of expertise: Corporate sustainability strategies; sustainable supply chains; clean energy policy and technology; energy efficiency and market transformation program design and implementation

    Office: Washington, D.C.

  • Silleck, Elizabeth Senior Conservation Manager, Gulf of Mexico Oceans Program

    Areas of expertise: Environmental Policy, Marine Conservation, Fisheries Management

    Office: Remote

  • Spiller, Beia Lead Senior Economist

    Areas of expertise: Electricity pricing, distributed energy resources, energy demand, transportation, air quality, shale gas

    Office: New York City

  • Stadler, Felice Sr. Dir., Campaigns, US Climate & Political Affairs

    Areas of expertise: Climate change, methane policy, strategic partnerships

    Office: Washington, D.C.

  • Sterner, Thomas Senior Contributing Economist

    Areas of expertise: Selection and design of environmental policy instruments; economics in general; climate and energy; natural resource economics

    Office: New York City

  • Symons, Jeremy Vice President, Political Affairs

    Areas of expertise: Political affairs; climate change solutions, U.S. climate change and energy policy; US Congress

    Office: Washington, D.C.

  • Takahashi, Taryn Manager, Methane Mapping

    Areas of expertise: Methane, natural gas policy, clean energy, greenhouse gas accounting, carbon offsets, emerging technologies

    Office: San Francisco

  • Thomas, Johanna Director of Planning and Strategy, Oceans Program

    Areas of expertise: Oceans programs, renewing fisheries, strategic planning

    Office: San Francisco

  • Tinning, Matt Associate Vice President, Oceans

    Areas of expertise: Oceans Program, US Fisheries, Environmental Policy, Environmental Law

    Office: Washington, D.C.

  • Tong, Clarence Legislative Affairs Manager

    Areas of expertise: Legislative process, Budget & Appropriations, U.S. energy policy

    Office: Washington, D.C.

  • Tripp, James T.B. Senior Counsel

    Areas of expertise: Ecosystems, rivers and deltas, trial-oriented litigation

    Office: New York City

  • Truax, Hawley Southeast Regional Director

    Areas of expertise: Policy analysis, writing/editing, institutional giving, strategy development, regional politics and culture

    Office: Raleigh, North Carolina

  • Ucar, Ferit Senior Clean Energy Economist

    Areas of expertise: Energy efficiency, distributed energy resources, energy policy, clean energy social justice.

    Office: New York City

  • Uennatornwaranggoon, Fern Manager, Air Quality Policy

    Areas of expertise: Community advocacy, air pollution, goods movement, environmental policy, air quality regulation, partnerships

    Office: San Francisco

  • Vargas, Melissa Project Manager, Political Affairs

    Areas of expertise: Climate change, strategic partnerships, public health

    Office: Washington, D.C.

  • Vogel, Sarah Vice President, Health

    Areas of expertise: Environmental health, chemical safety, endocrine disruptors

    Office: Washington, D.C.

  • Wagner, Gernot Consultant

    Areas of expertise: Climate change, climate economics, environmental markets, energy

    Office: Boston

  • Warner, Mandy Senior Manager, Climate and Air Policy

    Areas of expertise: Climate and air policy, power sector issues, pollution control technologies, regulatory policy, hazardous air pollutants, conventional pollutants, Congress.

    Office: Washington, D.C.