Dujella, Andrej - University of Zagreb, Croatia. Page on Diophantine m-tuples; Tables of high-rank elliptic curves; Link to mathematical departments and number theory groups and seminars; Information for students on courses in number theory and cryptography. Darmon, Henri - McGill University. Algebraic number theory, with a special emphasis on elliptic curves, modular forms, and their associated L-functions. Doud, Darrin - Brigham Young University. Cohomology of arithmetic groups, Galois representations. Papers, resources. Deanin, Alice - Villanova University. Computational number theory and Diophantine approximation. Teaching material, resources. Dodson, Maurice - University of York. Metrical Diophantine approximation, harmonic analysis and applications to signal processing, chaos and biology. Publications, teaching material. Dresden, Greg - Washington and Lee University. Mahler measure of polynomials. Publications. Drmota, Michael - Institut für Diskrete Mathematik und Geometrie, TU Wien. Number Theory; Combinatorial Enumeration and Analysis of Algorithms; Stochastic Processes in Combinatorial Structures. Publications, teaching. Dummigan, Neil - University of Sheffield. Arithmetical algebraic geometry. Publications. Diem, Claus - University of Leipzig. Arithmetic algebraic geometry: structure and arithmetic of abelian varieties; discrete logarithm problems; the regular inverse Galois problem. Publications, thesis. [Flags are language selectors.] Dickinson, Detta - NUI Maynooth. Measure theory and metric Diophantine approximation: Diophantine approximation on manifolds. Denef, Jan - University of Leuven. Number Theory, Algebraic Geometry, Singularity Theory and Mathematical Logic. Publications, software. Dasgupta, Samit - University of California, Santa Cruz. Arithmetic algebraic geometry. Preprints. Diaz y Diaz, Francisco - Université Bordeaux I. Computations in number fields. Preprints.