  The study of Emergent Universe models is based on the assumption that the
universe emerged from a past eternal Einstein Static (ES) state towards an
inflationary phase and then evolves into a hot big bang era. These models are
appealing since they provide specific examples of nonsingular (geodesically
complete) inflationary universes. However, it has been pointed out by
Mithani-Vilenkin that certain Emergent Universe scenarios which have a
classically stable ES state could experience a semiclassical instability and
collapse. In this paper, we investigate the classical and quantum stability of
the ES regime of Emergent Universes within the framework of Jordan-Brans-Dicke
theory. We demonstrate that when considering these models, it is possible to
have both, classical and semiclassical stability of the ES state without
addressing the instability highlighted by Mithani-Vilenkin.
