  Moments of the renormalized B-meson shape function provide a natural way to
define short-distance, running heavy-quark parameters such as the b-quark mass
and kinetic energy. These parameters are particularly well suited for studies
of inclusive decay distributions. The definitions of m_b and mu_pi^2 in this
``shape-function scheme'' are derived to two-loop order. Using previous
determinations of heavy-quark parameters in other schemes, we find
m_b=(4.63+-0.08) GeV and mu_\pi^2=(0.15+-0.07) GeV^2 at a reference scale of
1.5 GeV.
