  We use holography to study Conformal Phase Transitions, which are believed to
be realized in four dimensional QCD and play an important role in walking
technicolor models of electroweak symmetry breaking. At strong coupling they
can be modeled by the non-linear dynamics of a tachyonic scalar field with mass
close to the Breitenlohner-Freedman bound in anti de Sitter spacetime. Taking
the action for this field to have a Tachyon-Dirac-Born-Infeld form gives rise
to models that resemble hard and soft wall AdS/QCD, with a dynamically
generated wall. For hard wall models, the highly excited spectrum has the KK
form m_n ~ n; in the soft wall case we exhibit potentials with m_n ~ n^\alpha,
0<\alpha\leq1/2. We investigate the finite temperature phase structure and find
first or second order symmetry restoration transitions, depending on the
behavior of the potential near the origin of field space.
