2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/39669I discuss the connection between neutrino masses and leptogenesis. I use three prime examples: (1) canonical seesaw, (2) triplet Higgs, and (3) $R$ parity violation.14 pages, no figure, preprint version of talk at SILAFAE-III, Cartagena, Colombia (April 2000)High Energy Physics - Phenomenologytext