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We present a detailed, multi-wavelength study of star formation (SF) and AGNactivity in 11 near-infrared (IR) selected, spectroscopically confirmed,massive ($\gtrsim10^{14}\,\rm{M_{\odot}}$) galaxy clusters at $1<z<1.75$. Usingnew, deep $Herschel$/PACS imaging, we characterize the optical to far-IRspectral energy distributions (SEDs) for IR-luminous cluster galaxies, findingthat they can, on average, be well described by field galaxy templates.Identification and decomposition of AGN through SED fittings allows us toinclude the contribution to cluster SF from AGN host galaxies. We quantify thestar-forming fraction, dust-obscured SF rates (SFRs), and specific-SFRs forcluster galaxies as a function of cluster-centric radius and redshift. In goodagreement with previous studies, we find that SF in cluster galaxies at$z\gtrsim1.4$ is largely consistent with field galaxies at similar epochs,indicating an era before significant quenching in the cluster cores($r<0.5\,$Mpc). This is followed by a transition to lower SF activity asenvironmental quenching dominates by $z\sim1$. Enhanced SFRs are found in lowermass ($10.1< \log \rm{M_{\star}}/\rm{M_{\odot}}<10.8$) cluster galaxies. Wefind significant variation in SF from cluster-to-cluster within our uniformlyselected sample, indicating that caution should be taken when evaluatingindividual clusters. We examine AGN in clusters from $z=0.5-2$, finding anexcess AGN fraction at $z\gtrsim1$, suggesting environmental triggering of AGNduring this epoch. We argue that our results $-$ a transition from field-liketo quenched SF, enhanced SF in lower mass galaxies in the cluster cores, andexcess AGN $-$ are consistent with a co-evolution between SF and AGN inclusters and an increased merger rate in massive haloes at high redshift.

Star Formation and AGN Activity in Galaxy Clusters from $z=1-2$: a Multi-wavelength Analysis Featuring $Herschel$/PACS