Heising-Simons Foundation is a family foundation based in Los Altos and San Francisco, California. Founded by Mark Heising and Liz Simons, the foundation is dedicated to unlocking knowledge, opportunity, and possibilities. They work in various areas to bring about positive change in society.

The foundation focuses its grantmaking in several key areas, including climate and clean energy, human rights, community and opportunity, science, education, and technology and society. They aim to protect people and the planet from the impacts of climate change, support early childhood development, champion human rights, and support fundamental research in the physical sciences. Heising-Simons Foundation also provides grants to organizations and institutions that are at the forefront of their respective fields.

With a commitment to transparency, sustainability, and equity, the foundation works collaboratively with their partners to create a better future for all