Evergreen Collaborative is a left-of-center climate change advocacy group founded by former staffers to Gov. Jay Inslee’s (D-WA) 2020 presidential campaign.. It is a project of the New Venture Fund, a major pass-through funding and fiscal sponsorship nonprofit managed by the consulting firm Arabella Advisors in Washington, DC.  
Evergreen Collaborative is a project of the New Venture Fund; as such, it does not file annual Form 990 filings with the IRS or publicly reveal its donors, budget, and expenditures and grants to Evergreen in fact benefit its fiscal sponsor, which does not reveal its projects’ internal budgets.
However, at least one grant has been traced to Evergreen Collaborative: a $250,000 grant awarded in September 2020 from the Hewlett Foundation, a major left-of-center donor tagged for altering “U.S. National Policy.” 
As a project of the New Venture Fund, Evergreen Collaborative does not file annual Form 990 filings with the IRS. As such, any internal board of directors the group may have isn’t publicly revealed.
Evergreen’s founding leadership includes:
Sam Ricketts, Inslee’s climate director, a former Working Families Party operative, a former Democratic Governors Association director on climate issues, and senior fellow for energy and environment at the left-wing Center for American Progress. 
Bracken Hendricks, CEO of the “clean energy” construction project developer Urban Ingenuity, Inslee’s senior fellow for climate policy, a former senior fellow on climate for the Center for American Progress, and a former senior advisor to the Clinton Global Initiative on climate issues.  
Maggie Thomas, Evergreen’s political director and a former climate policy advisor to the 2020 presidential campaigns of Gov. Inslee and Sen. Elizabeth Warren (D-MA).