  Recent decades have seen a resurge of interest in hadron spectroscopy, driven
by new, high-luminosity experiments which have identified many new hadrons,
both expected and unexpected. The large number of unexpected hadrons suggest
contributions from additional quark and gluonic degrees of freedom to the
hadronic spectrum beyond the basic quark model. Photoproduction has emerged as
an attractive process to study hadron spectroscopy, due to the range of states
accessible in new and planned experimental facilities, complimentary kinematics
to other experiments where rescattering effects near thresholds are reduced,
and advances in our theoretical understanding of these reactions. This white
paper reviews the prospects for hadron spectroscopy from three major existing
and proposed facilities: the current GlueX experiment, the planned Electron-Ion
Collider, and a proposed JLab 24 GeV upgrade.
