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Department: Staff

Chelsey Ziegler-Scaffidi

Chelsey Ziegler-Scaffidi is the senior legal counsel at the Heising-Simons Foundation. Chelsey specializes in the law of exempt organizations, serves as a legal liaison to programs, and supports operations and corporate governance across the Foundation. Prior to joining the Foundation in 2022, Chelsey was counsel at the John D. and Catherine T. MacArthur Foundation where …

Aubrey Stevenson

Aubrey Stevenson is the office coordinator at the Heising-Simons Foundation’s Los Altos office. Prior to joining the Foundation in 2022, Aubrey worked for the City of Morgan Hill’s Recreation Department. Previously, she was an intern for California State Assemblymember Evan Low and worked on various political campaigns. Aubrey received a bachelor’s degree in political science …

Matt Oberhoffner

Matt Oberhoffner is a program officer for the Climate and Clean Energy program at the Heising-Simons Foundation. Matt has spent over a decade working on winning advocacy campaigns in the climate and clean air space, including securing federal greenhouse gas standards on vehicles and powerplants, as well as the first-ever federal methane leakage controls from …

Sedina Sinanovic

Sedina Sinanovic is a program associate for the Climate and Clean Energy program at the Heising-Simons Foundation. Prior to joining the Foundation in 2022, she was a fellow with the Schmidt Family Foundation where she researched climate change implications on human rights and its intersections with conflict, migration, and climate justice issues. She has previously …

Tina Oliva

Tina Oliva is a program associate for the Human Rights program at the Heising-Simons Foundation. Prior to joining the Foundation in 2022, Tina provided program support for Mission Asset Fund’s grant and credit-building programs for low-income and immigrant communities. She also is actively involved in the Latina Coalition of Silicon Valley which provides professional growth …

Gabriele Betancourt-Martinez

Gabriele Betancourt-Martinez is a program officer for the Science program at the Heising-Simons Foundation. Prior to joining the Foundation in 2021, Gabriele performed research in X-ray instrumentation and laboratory astrophysics as a postdoctoral researcher at the Institut de Recherche en Astrophysique et Planétologie in Toulouse, France. Previously, she was a NASA Space Technology Research Fellow …

Rachel Tuggy

Rachel Tuggy is a program associate for the Science program at the Heising-Simons Foundation. Prior to joining the Foundation in 2021, Rachel was a project lead at Digital NEST, a nonprofit in the Central Coast that builds young people’s professional confidence through workshops and resources. Previously, Rachel was a fellow of the Everett Program, a …

Roland Hwang

Roland Hwang is the director of the Climate and Clean Energy program at the Heising-Simons Foundation. Prior to joining the Foundation in 2021, Roland was the director of the Natural Resources Defense Council’s Climate & Clean Energy Program. He has also worked for seven years at the Union of Concerned Scientists directing their Transportation program. He …

Karimah Nonyameko

Karimah Nonyameko is a program officer with the Human Rights program at the Heising-Simons Foundation. Prior to joining the Foundation, Karimah worked for the National Alliance on Mental Illness South Carolina (NAMISC) as the Ending the Silence Lowcountry Regional Program Manager. Before joining NAMISC, Karimah worked with Encore.org’s Generation-to-Generation Program designing an online learning community …