Collider Verification of the Neutrino Mass Matrix in Two Scenarios

If the origin of neutrino mass is at the TeV energy scale, collider experiments may in fact {\it map out} all the elements of the $3 \times 3$ neutrino mass matrix, up to an overall scale. Two examples \cite{mrs,ma01} are discussed and one is related \cite{mr} to the muon anomalous magnetic moment.