What is the name of the foundation that awards 'genius grants', founded by John D. MacArthur?

What is the name of the foundation that awards “genius grants,” founded by John D. MacArthur? The answer is the John D. and Catherine T. MacArthur Foundation.

The foundation was established in 1970 by businessman John D. MacArthur and his wife, Catherine T. MacArthur. Based in Chicago, it supports nonprofit organizations, creative individuals, and networks working on issues such as climate change, nuclear security, journalism, justice, and local community needs.

Its best-known program is the MacArthur Fellowship, popularly called the “genius grant.” The fellowships recognize people showing exceptional originality and promise in creative work. Recipients are selected through a confidential nomination and review process, and the award comes with no formal project requirement.

The foundation itself prefers “MacArthur Fellow” rather than “genius,” because the nickname can obscure the award’s purpose. The organization also runs 100&Change, a competition that awards a major grant to a single proposal. It is separate from the MacArthur family’s personal trusts and from any fund formally called a “Genius Fund.”