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This set of selected papers of Klingenberg covers some of the important mathematical aspects of Riemannian geometry, closed geodesics, geometric algebra, classical differential geometry and foundations of geometry of Klingenberg. His contributions to Riemannian geometry were significant in the large, as well as opening a new era in global Riemannian geometry. He also introduced the Hilbert manifold of closed curves of class H1 on a Riemannian manifold. In connection with his work in closed geodesics, he became interested in the properties of the geodesic flow. Classical results from dynamical systems became useful tools for the study of closed geodesics. He was also credited for drawing closer together Riemannian geometry and Hamiltonian systems, which had developed separately since the time of H. Poincare.