Simons Foundation: Simons Collaborations in Mathematics and the Physical Sciences

Aim: to stimulate progress on fundamental scientific questions of major importance in mathematics, theoretical physics, and theoretical computer science, where a significant new development creates a novel area for exploration or provides a new direction for progress in an established field. The project should involve outstanding researchers with a range of career stages. Collaboration director must be from US or Canada, other participants may be from non-U.S. institutions. Funding: up to $2 million/year for 4 years.

https://www.simonsfoundation.org/funding/funding-opportunities/mathematics-physical-sciences/simons-collaborations-in-mathematics-and-the-physical-sciences/application-instructions/