The Maxwell-Bloch system of equations with inhomogeneous broadening is studied, and the local and global well-posedness of the corresponding initial-boundary value problem is established by taking advantage of the integrability of the system and making use of the corresponding inverse scattering transform (IST). A key ingredient in the analysis is the
L
2
{L}^{2}
-Sobolev bijectivity of the direct and IST established by Xin Zhou for the focusing Zakharov-Shabat problem.