Belle is a leader and organizer of climate and environmental organizations in Marin. During her long career as a public policy specialist, she has brought workable and lasting solutions to complex issues. In 2020, she recruited a team, successfully competed for endorsement from Drawdown Marin and launched the Marin Biomass Project. She also helped found and leads the Ecologically Sound Practices Partnership (ESP) and is co-chair of the To Lead on Climate coalition. She is chair of the longstanding climate education and advocacy group, Organizing for Action Marin. Previously, Belle was Director of Research and Public Policy at the University of California and, together with her late husband, Professor David Wilson, founded and led the Planning Management and Research Group Inc, a science policy consulting firm. She has studied with leading economists and worked on economic development abroad and in Washington DC. She has a BA from Mount Holyoke College and a MA degree from the Johns Hopkins School of Advanced International Studies.