Unveiling the epoch of reionization by simulations and high redshift galaxies The Epoch of Reionization marks after recombination the second major change in the ionization state of the universe going from a neutral to an ionized state. It starts with the appearance of the first stars and galaxies; a fraction of high energy photons emitted from galaxies permeate into the intergalactic medium (IGM) and gradually ionize the hydrogen until the IGM is completely ionized at z~6 (Fan et al. 2006). While the progress of reionization is driven by galaxy evolution it changes the ionization and thermal state of the IGM substantially and affects subsequent structure and galaxy formation by various feedback mechanisms. Understanding this interaction between reionization and galaxy formation is further impeded by a lack of understanding of the high redshift galactic properties such as the dust distribution and the escape fraction of ionizing photons. Lyman Alpha Emitters (LAEs) represent a sample of high redshift galaxies that are sensitive to all these galactic properties and the effects of reionization. In this the…