This volume contains the proceedings of the 26th International Conference on Operator Theory, held from June 27-July 2, 2016, in Timisoara, Romania. It consists of a careful selection of papers. One of the higlights is an extended presentation of the heliciodal method in harmonic analysis.

Other subjects covered include function theory on the unit disc; free holomorphic functions; applications of Toeplitz operators; traces on ideals of operators; geodesics of projections on Hilbert space; preserver problems; Sturm Liouville operators; and Bratteli diagrams.