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Optically quiescent quasars (OQQs) represent a recently systematised class ofinfrared-luminous active galactic nuclei (AGN) which have galaxy-like opticalcontinua. They may represent an interesting, brief phase in the AGN life cycle,e.g. either cocooned within high-covering-factor media or indicative of recenttriggering, though their nature remains unclear. Here, we present the firsttargeted simultaneous X-ray observations of an OQQ, our previously identifiedprototype, SDSS J075139.06+402811.2 at $z$=0.587. The source is significantlydetected over 0.5-16 keV with XMM-Newton and NuSTAR, unambiguously confirmingthe presence of current accretion activity. Spectral modelling yields anintrinsic luminosity $L_{\rm 2-10 keV}$ $\approx$4.4$ \times$10$^{43}$ ergs$^{-1}$, well within the AGN regime, but underluminous relative to itsinfrared power. It is lightly obscured, with log $N_{\rm H}$ [cm$^{-2}$]$\approx$22.

XMM-Newton and NuSTAR Observations of an Optically Quiescent Quasar