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As a colorless probe, direct photons balance the $p_T$ of the away-side jetat leading order. Direct photon-hadron correlations are thus an excellent probefor nuclear structure and QCD effects, including parton energy loss in theQuark-Gluon Plasma. PHENIX has measured $\pi^{0}$ and direct photon-triggeredtwo-particle azimuthal correlations in a variety of collision systems rangingfrom $p$$+$$p$ to Au+Au at 200 GeV. In $p$$+$Au and $d$$+$Au collisions, nomodification of the per-trigger jet yield or away-side correlation widthcompared to $p$$+$$p$ collisions is observed for direct photon triggeredcorrelations while an increase in the away-side width for $\pi^{0}$ triggeredcorrelations in $p$$+$Au has been measured. In Au+Au collisions, direct photonshave been identified statistically as well as using an isolation cut. Combiningdata sets from different collision systems allows us to quantify the transitionfrom suppression at high $z_T$ $(p_{T,h}/p_{T,\gamma})$ to the enhancement oflow $z_T$ particles relative to $p$$+$$p$, and to study this transition as afunction of trigger $p_T$.

PHENIX results on jet modification with $\pi^0$- and photon-triggered two particle correlations in $p$$+$$p$, $p(d)$+Au, and Au+Au collisions