  We demonstrate a new procedure to derive accurate and precise surface
gravities from high resolution spectra without the use of external constraints.
Our analysis utilizes Spectroscopy Made Easy (SME) with robust spectral line
constraints and uses an iterative process to mitigate degeneracies in the
fitting process. We adopt an updated radiative transfer code, a new treatment
for neutral perturber broadening, a line list with multiple gravity constraints
and separate fitting for global stellar properties and abundance
determinations. To investigate the sources of temperature dependent trends in
determining log g noted in previous studies, we obtained Keck HIRES spectra of
42 Kepler asteroseismic stars. In comparison to asteroseismically determined
log g our spectroscopic analysis has a constant offset of 0.01 dex with a root
mean square (RMS) scatter of 0.05 dex. We also analyzed 30 spectra which had
published surface gravities determined using the $a/R_*$ technique from
planetary transits and found a constant offset of 0.06 dex and RMS scatter of
0.07 dex. The two samples covered effective temperatures between 5000K and
6700K with log g between 3.7 and 4.6.
