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A confluence of scientific, financial, and political factors imply thatlaunching two simpler, more narrowly defined dark-energy/microlensingsatellites will lead to faster, cheaper, better (and more secure) science thanthe present EUCLID and WFIRST designs. The two satellites, one led by ESA andthe other by NASA, would be explicitly designed to perform complementaryfunctions of a single, dual-satellite dark-energy/microlensing ``mission''. Onewould be a purely optical wide-field camera, with large format and smallpixels, optimized for weak-lensing, which because of its simple design, couldbe launched by ESA on relatively short timescales. The second would be a purelyinfrared satellite with marginally-sampled or under-sampled pixels, launched byNASA. Because of budget constraints, this would be launched several yearslater. The two would complement one another in 3 dark energy experiments (weaklensing, baryon oscillations, supernovae) and also in microlensing planetsearches. Signed international agreements would guarantee the later NASAlaunch, and on this basis equal access of both US and European scientists toboth data sets.

Post-Decadal White Paper: A Dual-Satellite Dark-Energy/Microlensing NASA-ESA Mission