Who we are

Mosaic is by and for the field — the people and organizations who devote significant efforts in pursuit of environmental protection and healthy & just communities. We are guided by the expertise of a diverse and leaderful Governance Assembly, as well as by the rich learnings we gain from our grantees and other field leaders through our open RFPs. This is all enhanced by contributions from some of the country's preeminent movement thought leaders and supported by a constellation of funders that share our commitment to durable, collective impact.

Our team

Mosaic, a fiscally sponsored project of Tides Center, is led by a diverse constellation of environmental and justice leaders and supported by a small staff.

Governance Assembly


Abigail Dillen


Abigail Dillen is the President of Earthjustice, leading the organization's staff, board and supporters to advance the mission of using the courts to protect our environment and people's health.

Angela Mahecha Adrar

Tishman Environment and Design Center, The New School

Angela Mahecha Adrar is the Program Director of the Environmental Justice Movement Fellowship. She has committed her life to advancing the role of the grassroots sector and provides agile leadership and structure to address and adapt to the changing and complex priorities of local communities while influencing national and international agendas.

Collin O'Mara

National Wildlife Federation

Collin O'Mara is the President and CEO of the National Wildlife Federation, America's largest wildlife conservation organization with more than six million members and 52 state and territorial affiliates.

David Beckman

Pisces Foundation

David Beckman is President of the Pisces Foundation and its founding staff member. He leads the Foundation's efforts to support innovators working to ensure people and nature thrive. Since 2017, he also has worked with partners to create Mosaic. Previously, David led the Water Program at the Natural Resources Defense Council.

Gabrielle Strong

NDN Collective

Gaby Strong, citizen of Sisseton-Wahpeton Dakota Oyate, is the Director of Grantmaking for NDN Collective, a national Indigenous-led community development organization, where she oversees grantmaking strategy. Gaby has nearly forty years of experience in philanthropic, non-profit and tribal arenas.

Jacqueline Patterson

The Chisholm Legacy Project

Jacqueline Patterson is the Founder & Executive Director of The Chisholm Legacy Project. Since 2007, Patterson has served as coordinator & co-founder of Women of Color United. She has worked as a researcher, program manager, coordinator, advocate and activist working on gender justice, HIV&AIDS, racial justice, economic justice, and environmental and climate justice.

Kate Sinding Daly

NorthLight Foundation

Kate Sinding Daly is the Executive Director of NorthLight Foundation. Prior to her current role, she was senior advisor to the president of the Natural Resources Defense Council (NRDC), a senior attorney and deputy director of NRDC's New York program, and was a partner in the specialty environmental law firm of Sive, Paget & Riesel, P.C.

Melissa Lin Perrella

Natural Resources Defense Council

Melissa Lin Perrella is the Natural Resources Defense Council's (NRDC) Senior Director of the Environmental Justice, Healthy People & Thriving Communities program where she represents communities that have been hardest hit by freight-related air pollution.

Mily Treviño-Sauceda

Alianza Nacional de Campesinas, Inc.

Mily Treviño-Sauceda is the Executive Director & Co-Founder of Alianza Nacional de Campesinas, Inc., the first national farmworker women's organization in the U. S. created by current and former farmworker women, along with women who hail from farmworker families.

Miya Yoshitani

Asian Pacific Environmental Network

Miya Yoshitani is the Executive Director of the Asian Pacific Environmental Network (APEN). A movement leader in many key local, state, and national alliances, APEN is helping to shift the center of gravity of what is possible when the health and economic well being of working families, immigrant and communities of color are put at the center of solutions to the economic and climate crises.

Rahwa Ghirmatzion

PUSH Buffalo

Rahwa Ghirmatzion is the Executive Director of PUSH, a community organization that works at the grassroots to create and implement a comprehensive revitalization plan for Buffalo's West Side, with more than $60 million invested in affordable housing rehabilitation, solar installation, green jobs training, weatherization and green infrastructure.

Rashad Morris

Bullitt Foundation

Rashad Morris is a Program Officer with the Bullitt Foundation where he manages the Foundation's Energy, Climate, and Materials and Deep Green Buildings programs.

Tonya Bonitatibus

Savannah Riverkeeper

Tonya Bonitatibus is the Riverkeeper and Executive Director of Savannah Riverkeeper, watching over the health and vibrancy of the Savannah River. She has served in that role for over 13 years, helping successfully guide the organization through threats to water quality, including the recent fight against the Palmetto Pipeline.


Katie Robinson
Project Director
Katie Robinson is Mosaic’s Project Director, leading the development and launch of Mosaic. She supports the field-led Governance Assembly in executing the initiative’s inclusive grantmaking process, participatory governance, and outreach and engagement.
Jennifer Lesorogol
Program Officer
Jennifer Lesorogol is Mosaic’s Program Officer, leading the programmatic work of the project and supporting Mosaic’s community engagement and Governance Assembly.
Moriah Jacobs
Operations Manager
Moriah Jacobs is Mosaic's Operations Manager, overseeing the project's operations and serving as key point of contact to stakeholders.
Lucas Donavan-Lafuente
Lucas Donavan-Lafuente is Mosaic's Fellow.

Funding partners

Mosaic's work is supported by a community of systems-focused funders who understand that we need to build power at an unprecedented scale if we are to affect the kind of durable, transformational environmental progress our world needs right now. We stand ready to welcome additional funding partners to this community of purpose. Together, we can support a movement that is better connected, aligned, and collaborative, enabling us to win the biggest victories together.

For more information, please contact Katie Robinson.

Our values


Center equity and transparency, engaging people and organizations of all sizes and types, not just funders or large organizations


Seek and incorporate broad input into initiative design and governance, sharing power and agency


Reinforce and complement field-wide capacity, focusing on amplifying the work of others


Continuously experiment, iterate, and adapt based on feedback and experiences, both successes and failures


Pledge to boldness in unlocking systems-level opportunities

Our commitment to equity

Mosaic is dedicated to contributing to building a more connected, effective, inclusive, and just environmental movement. We direct significant resources to BIPOC, low-income, women, LGBTQ+, environmental justice, rural, immigrant, and other socially & economically disadvantaged movement members. We build and support connections, collaborations, and shared resources across the full breadth of the environmental field in all its richness and diversity. This includes supporting and building bridges between organizations and approaches that reflect the political, geographic, economic, social, sectoral, and issue area diversity of the environmental movement.

This is not just the right thing to do — it's critical to bolstering a winning, equitable environmental movement with the scale and alignment needed to prevail on the issues that matter most.

For more on Mosaic's grantmaking values, please see here.