  A multi-TeV muon collider offers a spectacular opportunity in the direct
exploration of the energy frontier. Offering a combination of unprecedented
energy collisions in a comparatively clean leptonic environment, a high energy
muon collider has the unique potential to provide both precision measurements
and the highest energy reach in one machine that cannot be paralleled by any
currently available technology. The topic generated a lot of excitement in
Snowmass meetings and continues to attract a large number of supporters,
including many from the early career community. In light of this very strong
interest within the US particle physics community, Snowmass Energy, Theory and
Accelerator Frontiers created a cross-frontier Muon Collider Forum in November
of 2020. The Forum has been meeting on a monthly basis and organized several
topical workshops dedicated to physics, accelerator technology, and detector
R&D. Findings of the Forum are summarized in this report.
