Anna J. Siefken is a clean energy and infrastructure executive with more than 20 years of experience guiding organizations through complex energy markets, capital-intensive assets, and regulatory environments. Her work focuses on financial strategy, market design, policy risk, and infrastructure deployment for utilities, large energy users, technology companies, and growth-stage platforms. Siefken currently serves as Director for Policy & Markets, North America for the Long Duration Energy Storage (LDES) Council, where she guides the Secretariat's strategy and policy efforts to develop markets for existing and emerging clean energy storage technologies. In this capacity, she represents the Council and its members in federal and state regulatory proceedings, ISO and RTO market processes, and stakeholder forums, working closely with utilities, regulators, system operators, hyperscalers, and private sector leaders to advance market frameworks that support grid reliability, capital investment, and commercial adoption of LDES technologies. Previously, Siefken served as Principal Deputy Director of U.S. Department of Energy’s Federal Energy Management Program, overseeing the decarbonization of 3B sq ft (350k buildings) with $137M in projected annual savings and $4.1B in private investment potential. Siefken has held executive leadership roles at Carnegie Mellon University’s Wilton E. Scott Institute for Energy Innovation, ICF, and The Home Depot. Siefken is an appointed U.S. Ambassador for Clean Energy Education and Empowerment (C3E).