• Email: aristeidis.tsakiris@un.org
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Bio

Aristeidis Tsakiris is a Mechanical Engineer with over ten years of experience driving energy efficiency initiatives globally. With an MSc in Sustainable Energy from the Technical University of Denmark (DTU), he combines technical expertise with a deep understanding of policy and digital systems to support sustainable development in emerging and developing economies.

At the UNEP Copenhagen Climate Centre (UNEP-CCC), he leads the development of Monitoring & Evaluation systems, digital dashboards, and web-based Knowledge Management Systems (KMS). His work enhances data-driven decision-making and supports the dissemination of best practices through webinars, podcasts, and e-learning platforms, while also contributing to project development, reporting, and stakeholder engagement.

Previously, Aristeidis held key roles at the Copenhagen Centre on Energy Efficiency (C2E2), where he managed digital tools, coordinated over 100 webinars, and supported international workshops and publications. His early career in research and consultancy focused on energy-efficient buildings and transport, laying a strong foundation for his current impact in global energy transition efforts.

• Email: debbie.weyl@wri.org
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Debbie Weyl is the Manager, Building Efficiency with the WRI Ross Center for Sustainable Cities. She manages the Building Efficiency Accelerator, a global partnership to accelerate building energy efficiency in cities around the world. Prior to WRI, Debbie worked for 5 years at CLASP to improve globally the environmental and energy performance of appliances, lighting and equipment, and for 2 years at the U.S. Department of Energy on energy efficiency programs in the United States.

• Email: Curt.Garrigan@unep.org
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Curt Garrigan is currently the Cities and Buildings Programme Manager for the United Nations Environment Programme- Division of Technology, Industry and Economics in Paris, France, and has served as coordinator of the Sustainable Buildings and Climate Initiative (UNEP-SBCI). He also coordinates UNEP’s efforts to assist countries in developing Nationally Appropriate Mitigation Actions (NAMAs) for the building sector. He is active in promoting sustainable buildings programmes with member states, NGOs and other international agencies, including for COP21 in Paris in December 2015, where he helped to launch the Global Alliance for Buildings and Construction was launched.

• Email: sbg3u@virginia.edu
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Dr. Gordon earned his PhD in Government and Politics at the University of Maryland and is a Certified Public Purchasing Officer (CPPO). He has experience as a researcher, professor, and practitioner, having worked as the Director of Procurement for the City of Alexandria, VA and Director of Purchasing for Nashville and Davidson County, TN.

• Email: angie.fyfe@iclei.org
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Maira Macedo is an Architect and Urbanist, Coordinator of Institutional and Government Relations in Green Building Council Brazil. Master in Architecture and Sustainability by the Polytechnic Foundation of Catalonia, UPC (Barcelona) completed in 2008 and MBA in Real State Business by Escola de Propaganda e Marketing, ESPM (São Paulo) completed in 2013. Experience in solar energy and sustainable architecture, real estate development, project management and approval, monitoring and implementation of process and production control, product development and management of designers.

• Email: jradoff@yrgxyz.com
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Bio

Josh holds a Masters in Sustainable Energy from the KTH Royal Institute of Technology (Stockholm) and a Masters in Electrical Engineering from Columbia University (New York). Josh is the co-founder and principal at YR&G where he provides technical and strategic sustainability services for companies, communities, and building projects globally. Josh is a member of the US Green Building Council market advisory committee and regularly consults on the design and construction of building projects seeking certification through LEED, WELL building, and other voluntary rating programs.