The recent theoretical studies of atomic resonances involving positrons are reviewed. The topics under discussions are the doubly-excited states of the positronium negative ion and resonance scattering in e+–H, e+–He+, Ps–H, e+–He, e+–Li, e+–Na and e+–K.
Low Energy Positron and Positronium Physics Proceedings of the \{XIV\} International Workshop on Low Energy Positron and Positronium Physics