Warren Leon is Executive Director of the Clean Energy States Alliance. He oversees the organization’s day-to-day operations and leads strategy development. He has written and edited many reports for CESA, including serving as lead author for Returning Champions: State Clean Energy Leadership Since 2015 and Solar with Justice: Strategies for Powering Up Under-Resourced Communities and Growing an Inclusive Solar Market. Prior to working for CESA, Warren was Director of the Massachusetts Renewable Energy Trust, Executive Director of the Northeast Sustainable Energy Association, and Deputy Director for Programs at the Union of Concerned Scientists. He co-authored the influential book The Consumer's Guide to Effective Environmental Choices. He holds a Ph.D. from Harvard University.