Description:This volume contains contributions originating from the International Workshop on Operator Theory and Its Applications (IWOTA) held in Newcastle upon Tyne in July 2004. The articles expertly cover a broad range of material at the cutting edge of functional analysis and its applications. Topics include scattering and time varying systems, pseudodifferential and singular operators, weighted composition operators and hyperinvariant subspaces, and interpolation and lifting problems on Hilbert and Krein spaces.