  I report on the progress of two new muon anomalous magnetic moment
experiments, which are in advanced design and construction phases. The goal of
Fermilab E989 is to reduce the experimental uncertainty of $a_\mu$ from
Brookhaven E821 by a factor of 4; that is, $\delta a_\mu \sim 16 \times
10^{-11}$, a relative uncertainty of 140~ppb. The method follows the same
magic-momentum storage ring concept used at BNL, and pioneered previously at
CERN, but muon beam preparation, storage ring internal hardware, field
measuring equipment, and detector and electronics systems are all new or
upgraded significantly. In contrast, J-PARC E34 will employ a novel approach
based on injection of an ultra-cold, low-energy, muon beam injected into a
small, but highly uniform magnet. Only a small magnetic focusing field is
needed to maintain storage, which distinguishes it from CERN, BNL and Fermilab.
E34 aims to roughly match the previous BNL precision in their Phase~1
installation.
