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We develop a method to identify proto-clusters based on dark matter halosrepresented by galaxy groups selected from surveys of galaxies at highredshift. We test the performance of this method on halos in N-bodysimulations, and find it can correctly identify more than 85% of the trueproto-clusters with $\gtrsim$ 95% purity and with mass estimates typical within0.25 dex from their true values. We show how the information provided by theproto-clusters can be used to link galaxies in present-day clusters of galaxieswith their high redshift progenitors. Our tests show that the proto-clustersidentified by our method can recover reliably the progenitor stellar massdistribution of galaxies, thereby providing an avenue to investigate theformation and evolution of present-day galaxy clusters and their membergalaxies.

Finding proto-clusters to trace galaxy evolution: I. The finder and its performance