EXO -- An overview

EXO is a program to develop and operate large neutrino-less double-beta decay experiments and measure Majorana neutrino masses with an ultimate sensitivity below 10 meV. In this talk I will survey the different activities in progress, including the status of the EXO-200 detector that is approaching data taking and the R\&D on Ba tagging and on large detectors in gaseous phase. The talk is given on behalf of the EXO collaboration including scientists from Canada, Russia, Switzerland and the US.