  The search for neutrinoless double-beta decay is the most sensitive technique
to establish the Majorana nature of neutrinos. Two operating experiments that
look for such decays in $^{76}$Ge -- GERDA and the MAJORANA DEMONSTRATOR --
have achieved the lowest backgrounds and the best energy resolution in the
signal region. These are two of the most important detector characteristics for
sensitive searches of this undiscovered decay. The Large Enriched Germanium
Experiment for Neutrinoless Double Beta Decay (LEGEND) Collaboration has formed
to pursue a tonne-scale $^{76}$Ge experiment that integrates the best
technologies from these two experiments and others in the field. The
Collaboration is developing a phased experimental program that uses existing
resources as appropriate to expedite physics results, with the ultimate
discovery potential at a decay half-life beyond $10^{28}$ years. In these
proceedings, we will present the physics case, R&D efforts and implementation
strategies of the LEGEND experiment.
