Neutrino masses represent a crucial ingredient for Leptogenesis, an attractive explanation of the observed matter-anti matter asymmetry of the Universe and a direct cosmological consequence of the seesaw mechanism. This is an elegant way to understand why neutrinos are massive and why they are so light compared to all other Standard Model particles. We will discuss recent developments in Leptogenesis, showing the implications of the current information on the neutrino mass spectrum from neutrino mixing data and the importance of a future determination of the absolute neutrino mass scale. Moreover, by mean of a simple geometric tool, we will describe how Leptogenesis can be used as a powerful phenomenology to test the seesaw mechanism. We will conclude presenting a new interesting scenario of leptogenesis.

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