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We report the X-ray detection of two z>1.4 infrared-selected galaxy clustersfrom the IRAC Shallow Cluster Survey (ISCS). We present new data from theHubble Space Telescope and the W. M. Keck Observatory that spectroscopicallyconfirm cluster ISCS J1432.4+3250 at z=1.49, the most distant of 18 confirmedz>1 clusters in the ISCS to date. We also present new spectroscopy for ISCSJ1438.1+3414, previously reported at z = 1.41, and measure its dynamical mass.Clusters ISCS J1432.4+3250 and ISCS J1438.1+3414 are detected in 36ks and 143ksChandra exposures at significances of 5.2 sigma and 9.7 sigma, from which wemeasure total masses of log(M_{200,Lx}/Msun) = 14.4 +/- 0.2 and14.35^{+0.14}_{-0.11}, respectively. The consistency of the X-ray and dynamicalproperties of these high redshift clusters further demonstrates that the ISCSis robustly detecting massive clusters to at least z = 1.5.

X-Ray Emission from Two Infrared-Selected Galaxy Clusters at z>1.4 in the IRAC Shallow Cluster Survey