Preface. - Curriculum William Feller 1906-1970.- Bibliography of William Feller. - PhD Students of William Feller. - R. L. Schilling and W. A. Woyczy´ William Feller. A Biography. - E. Baake and A. Feller's Contributions to Mathematical Biology.- N. Feller on Differential Operators and Semi-groups. - M. Feller's Contributions to the One-Dimensional Diffusion Theory and Beyond.- G. On Boundary Behaviour of One-Dimensional From Brown to Feller and Beyond. - R. Feller's Work in Renewal Theory, the Law of the Iterated Logarithm and Karamata Theory. - Selected Papers of William Feller.