Wimps with a capital W: The Singlet Doublet Model and Beyond

The singlet-doublet fermion model of dark matter is an economical weak-scale dark matter model, which realizes the dark matter abundance through interactions with the weak bosons of the Standard Model.  Despite the simplicity of the model, depending on the size of the Yukawa couplings in the model, the dark matter relic abundance can be realized via freeze-out (including co-annihhilation), co-scattering, freeze-in, or a super WIMP mechanism.  We  discuss the ways this model can realize the dark matter density and how it might (or might not be) tested in upcoming experiments.