Angie Fyfe

Executive Director

Angie Fyfe joined ICLEI USA in 2014 as the Director of Resource Efficiency and Renewable Energy. She was promoted to Executive Director on January 1, 2016.

Angie’s strategic vision for the organization is to create exceptional value for ICLEI local government members, partners, and funders by harnessing the power of the ICLEI network and the deep expertise ICLEI has developed since it was formed by local elected officials in 1990, and to build on ICLEI’s unique global role as the focal point for local governments in the United Nations Framework Convention on Climate Change (UNFCCC).

With a focus on climate finance and the implementation of the Paris Agreement, she aims to weave health and equity considerations into ICLEI USA offerings based on her interest in human-centered design.

Angie’s previous experience includes serving as the Associate Director and program manager of the Colorado Governor’s Energy Office, where she was part of the team to develop and implement 57 pieces of clean energy legislation under Governor Bill Ritter, and as the executive director of the U.S. Green Building Council, Colorado Chapter. Additionally, Angie was the founder of an online real estate services company and the Real Estate Product and Partnership Manager of global corporate relocation services firm. Her clients included Johnson & Johnson, Fidelity Investments, Costco, IBM, CH2MHill, and Frist Data Western Union.

Angie is a LEED AP O+M and holds a Bachelor of Science in Business Administration, Finance. With a wealth of sustainability leadership experience, she actively advises the City of Denver on its climate action agenda as a member of the Denver Mayor’s Office of Sustainability Advisory Council. Her former advisory positions include the Energy Efficiency and Conservation Block Grant sub-committee, appointed by the U.S. Department of Energy to advise Secretary of Energy, Steven Chu, the University of Colorado Denver speakers’ bureau Wirth Chair Sustainability Series, and the Women in Sustainable Energy non-profit. In 2014, the Denver Business Journal named her one of Colorado’s Top Women in Energy.

Angie and her husband live in a small bungalow near a Denver urban park where, when she’s not traveling for work, she can often be found taking an early morning run. Their daughter is a recent college graduate, now teaching in New Orleans with the Teach for America program and their son is studying Industrial Design at the Savannah College of Art & Design.


Calyn Hart

Program Officer

Calyn Hart joined ICLEI USA in 2018 as a Statewide Energy Efficiency Collaborative (SEEC) Program Associate and currently serves as a Program Officer. Calyn provides technical assistance to local governments on GHG inventorying and climate action planning using the ClearPath tool. In addition to running training cohorts, Calyn also works to develop energy efficiency resources and incorporate climate equity throughout California.

Calyn received her bachelor’s degree in Environmental Business and Biology in 2017 from the University of Redlands in Southern California. After graduating, Calyn went to work in the environmental field through the CivicSpark Fellowship program aiding the City of Santa Clara. During her CivicSpark Fellowship, Calyn updated the City’s Local Government Operations and Community greenhouse gas inventories, produced the City’s Climate Action Plan Annual Report, provided the framework for a Transportation Demand Management Plan and as well as the Climate Action Plan Update. After completing the CivicSpark Fellowship, Calyn continued on with the City of Santa Clara working on many climate and sustainability initiatives including the City’s Pilot Residential Food Scraps Recycling Program, the County Green Business Certification Program, and community outreach regarding the proper disposal of waste.


Eli Yewdall

Senior Program Officer

Eli Yewdall is a Senior Program Officer developing resources to help local governments measure, manage and reduce greenhouse gas emissions. Eli supports ongoing development of ICLEI’s protocols, tools, and guidance and training materials in the areas of greenhouse gas inventories, forecasting, and climate action planning. Eli also leads ICLEI’s work engaging local governments in the development process for improved building energy codes.

Before joining ICLEI, Eli worked for two years as a full-time volunteer with St Joseph’s House of Hospitality in Rochester, NY to provide meals and shelter to and advocate on behalf of homeless individuals. Eli has also produced educational materials on climate change for the Environmental Justice and Climate Change Initiative.  Eli has a Masters in Energy and Resources from the University of California, Berkeley, and a BS from Gonzaga University.



Jesse Carpentier

Program Officer

Jesse provides technical assistance to ICLEI members on resilience and adaptation planning. Before joining ICLEI, Jesse worked for the Federal Emergency Management Agency (FEMA) Region 9 as a Hazard Mitigation Planner. In this role, she provided technical assistance to local, tribal, and state agencies on hazard mitigation and climate adaptation planning, and reviewed plans for consistency with federal grant requirements. Prior to FEMA, Jesse was an Environmental Planner with Rincon Consultants, where she conducted environmental impact analyses for proposed projects and quantified greenhouse gas emissions for various sustainability initiatives. She has a Master of City and Regional Planning degree from Cal Poly State University, and a B.A. in Economics from Humboldt State University. When she’s not working, she is probably riding her bike, playing music, or reading a book in the company of her cat-children, Jordy and Josie.


Kale Roberts

Senior Program Officer

Kale joined the ICLEI USA team in 2016 to provide technical assistance to ICLEI members on greenhouse gas emission inventories, sustainability and climate action planning, and to develop climate vulnerability assessments. Since 2018, he has worked as network coordinator and communications lead while serving as a U.S. local government liaison to the United Nations.

Before joining ICLEI USA, Kale worked with the United Nations Development Programme’s Climate Change Adaptation Team from the Bangkok Regional Hub. He supported countries throughout the Asia-Pacific region to develop proposals aimed at unlocking climate finance for adaptation projects. Kale also is a former editor of Mother Earth News, North America’s largest sustainable living magazine, where he coordinated climate and energy content. From 2010 to 2012, he served as a U.S. Peace Corps volunteer in rural Thailand, where he worked on a project with the Thai Ministry of Energy to build home-scale biogas digesters and initiate carbon accounting in community forests. Kale received an M.S. in Climate Science and Policy from the Bard Center for Environmental Policy and a B.S. in Environmental Science from Humboldt State University.


Matthew Katz

Program Associate

Matthew Katz joined ICLEI USA in 2019 as a Graduate Fellow providing technical assistance for Colorado regional climate action efforts and the American Cities Climate Challenge. As a Program Associate, Matthew provides technical assistance to ICLEI members on GHG inventory and emissions forecasting using the ClearPath tool. Additionally, he assists in developing an ICLEI-led Americorps service program in which members will collaborate with Colorado local and regional governments to advance climate, resilience, and sustainability initiatives. Matthew received his Bachelor’s Degree in Sustainability Studies and a minor in Geography and Geographic Information Science from the University of Illinois at Urbana-Champaign. After, Matthew received a Master of Science in Environmental Policy and Management from the University of Denver.


Sarah Ditton

Climate Communications Associate

Sarah Ditton joined ICLEI USA in 2020 as the Climate Communications Associate and AmeriCorps Program Manager. In her communications role, Sarah is spreading awareness of ICLEI USA’s cutting-edge service, tools, and network. In her AmeriCorps role, Sarah assists in developing an ICLEI-led AmeriCorps Climate and Resilience Corps service program. 

Before joining ICLEI USA, Sarah worked for the Boulder Housing Coalition, where she ran successful fundraising campaigns and improved staff efficiency. Additionally, Sarah is the Chair of the Boulder County Food Waste Committee. Sarah received a Masters of the Environment (M.E.N.V.) specializing in Sustainable Food Systems from CU Boulder. For her Master’s Capstone, she worked with the City of Boulder Climate Initiatives Team to run a county-wide Food Waste Awareness Week and suggest novel programs and policies to reduce the amount of wasted food. Sarah received a B.A. in Biological Sciences specializing in Microbiology from Cornell University. For fun, Sarah reads, dances, plays ultimate frisbee, and frolics with her dog.


Tom Herrod

Senior Program Officer

Tom Herrod joins ICLEI USA after 10 years working for the City & County of Denver’s Climate Action Team. As a Climate Policy Analyst, Tom worked to update Denver’s greenhouse gas inventory to be GPC- and CRF-compliant. Under Tom’s guidance, Denver received Global Covenant of Mayors Compliant Status as well as a Leadership ranking from CDP. Using GHG data, Tom successfully brought a number of initiatives to Denver, including the City Energy Project, while also managing Denver’s Energy Efficiency & Community Block Grant Program. Most recently, Tom led Denver’s 80×50 Climate Goal Stakeholder and Community Input Process, leading to a number of interim goals, targets, and strategies to achieve Denver’s Climate Goals. Tom has over 20 years of experience working in local, state, tribal, and federal environmental programs, including 5 years with the U.S. Environmental Protection Agency’s Office of Inspector General. Tom received his bachelor’s degree in Natural Resources form the University of Nebraska, and a master’s degree in Environmental Policy & Management from the University of Denver. Tom also completed doctoral research in Aquatic Resources at Texas State University. Tom’s other interests include applying wetland restoration and regenerative agriculture practices at a family ranch in western Nebraska.