Haley Mellin is an artist and conservationist. She founded the nonprofit organization Art to Acres to support large-scale land conservation; to this day, it has supported 11 million hectares of new protected landscapes focusing on biodiversity conservation. To engage climate sustainability in art communities, Mellin co-founded Conserve.org (New York, 2017); the MOCA Environmental Council (Los Angeles, 2020); Art and Climate Action (San Francisco, 2020); Artists Commit (New York, 2020) and GCC New York (New York, 2023).

Mellin initiated the first carbon emissions calculations for museum exhibitions in the United States and Germany, including for the Museum of Contemporary Art Chicago, Solomon R. Guggenheim Museum, ICA Miami, and Kunstmuseum Bonn. These calculations involve carbon emissions reduction education and institutional sustainability advising. She has since widened her support to cultural institutions in Europe and the Middle East. For these pro-bono emissions assessments, Mellin received grants from the Teiger Foundation in 2022 and 2023.

Mellin currently focuses on observational painting in nature. Her recent exhibitions include The Journal Gallery, New York; Fondazione 107, Italy; Alexander Berggruen, New York; MoMA Ps1, New York; Bischoff Projects, Germany; Museum Dhondt-Dhaenens, Belgium, and Museo Pino Pascali, Italy. A graduate of the University of California at Berkeley, Mellin received a PhD from New York University in Visual Culture and Education, and atttended the Whitney Museum Independent Study Program. The artists Rose Shakinovsky and Claire Gavronsky are long-stranding mentors.