  Direct-photon measurements in p+p and Au+Au collisions at sqrt{s_{NN}} = 200
GeV from the PHENIX experiment are presented. The p+p results are found to be
in good agreement with next-to-leading-order (NLO) perturbative QCD
calculations. Direct-photon yields in Au+Au collisions scale with the number of
inelastic nucleon-nucleon collisions and don't exhibit the strong suppression
observed for charged hadrons and neutral pions. This observation is consistent
with models which attribute the suppression of high-pT hadrons to energy loss
of quarks and gluons in the hot and dense medium produced in Au+Au collisions
at RHIC.
