  Direct determination of fundamental stellar parameters has many profound and
wide-ranging impacts throughout astrophysics. These determinations are rooted
in high angular resolution observations. In particular, as long-baseline
optical interferometry has matured over the past decade, increasingly large
survey samples are serving to empirically ground the basic parameters of these
building blocks of the universe. True imaging and improved parametric fitting
are becoming routinely available, an essential component of fully
characterizing stars, stellar environments, and planets these stars may host.
