  A new measurement of the anomalous magnetic moment of the muon, $a_{\mu}
\equiv (g-2)/2$, will be performed at the Fermi National Accelerator Laboratory
with data taking beginning in 2017. The most recent measurement, performed at
Brookhaven National Laboratory and completed in 2001, shows a 3.5 standard
deviation discrepancy with the standard model prediction of $a_\mu$. The new
measurement will accumulate 21 times those statistics using upgraded detection
and storage ring systems, enabling a measurement of $a_\mu$ to 140 ppb, a
factor of 4 improvement in the uncertainty the previous measurement. This
improvement in precision, combined with recent and ongoing improvements in the
evaluation of the QCD contributions to the $a_\mu$, could provide a 7.5$\sigma$
discrepancy from the standard model if the current difference between
experiment and theory is confirmed, a possible indication of new physics.
